Okay, so I'm going to start this out by apoligizing for an incredibly lengthy post. I had time and little else I could do as someone else was using my computer so I went through every single Sentinels deck and looked for things. This post is basically an info dump of speculation, questions, comments, and things we probably already know but I want to gather together here just in case.
Possible/confirmed character identities and new people:
Prime Wardens Haka seems to be on Parse's Between The Lines. He is wearing a completely new outfit, but still is Haka.
The Rich guy on Wraith's Trust Fund could be the CEO of Revocorp, AKA Revenant. This would allow a signifigant character to be placed in the card without revealing his ID. Otherwise he might just be a random rich guy which is boring to me.
Revenant might also be important to Synaptic Interruption. If he uses missiles as suggested by Setback's card, that explains where the missile came from, also his undersuit is blue, which if Revenant had been hit once with a missle already the scene would make visual sense. Very weak speculation though.
The No Executions Bounty has been confirmed by Christopher to be Citizen Truth.
The Whole Gang Bounty is the Crackjaw Crew. Ember from Crew bears a resemblance in power and face to Citizen Summer, difference is in hair length. Signifigant?
With this and Doc Tusser every character in Chrono-Ranger's deck seems to have been ID'd
The Robot Unity is building in Flash Forge seems to be Voss, has the Thorian Spikes. Signifigance?
Bearded guy on Motivational charge has never been ID'd, I think. Could be Beard Ra or Citizen Anvil. I like to see this as Legacy accidentally punching Ra when he shows up for the first time after his exile.
There is a blond haired guy in both Back-fist Strike and Combat Stance. They seem to be two different individuals, but could possibly be the same person. No idea who they are.
Furry guy from Visionaries Suggestion has not been ID'd. Possible alien?
Revenant is the second person on Shock Rounds.
Slash is the figure on Incendiary Rounds.
Argentium is the figure on Hollow Points. Note: Argentium is a type of Sterling Silver Alloy. Not sure of signifigance.
Still no ID for the Red guy on Flash Flood and The Sentinel's Cooridinated Assault. He may also be the owner of the Giant Gree hand on KNYFE's Null-shield. Strong possibility of being an alien.
No ID on the Green Frankenstein guy from Tachyon's Lightspeed Barrage.
Ruin is the figure in Scherzo of Frost and Flame
No ID on little girl from Rhapsody of Vigor
Man-Grove is the monster on Nightmist's Call Forth
The Seer is on Heedless Lash. Name of The Seer seems odd choice to me, might have signifigance as to his role within story.
In Isolated Hero the purple figure bears a strong resemblance to Vyktor, new nemesis card, without the Thorian spikes. Not sure if they are retractable, have been removed, or if this is just a coincidence.
Cat stuck in Tree has strong possiblity of being an Alien from our new gladiatorial arena, it could the a "space-lion" for feeding people to
Setback's Looking Up seems to have The Chairman in it. When looking at the Blighted Streets and Vigilance Cards the man with the mustache seems to be similiar, though Blighted Streets would be Mr. Lilya as the girl is confirmed to be Ermine, unless she was adopted? Either coincidence or very interesting
The Silver enemy on Over Do It seems to have the alchemical symbol on his forehead, possibly the same being as from Reveal the Flaws
Interesting note that Ruin has a mark on his forehead as well, different but possibly shows a connection?
Who is the Blond Woman Spite is holding in Snap Decision? I feel like I know her
Naturalist's nemesis seems to be the dino/fish headed alien from WotC, who appears on his incap and on the card Indomitable Force. He could also be a sulph-orc reference but I am uncertain. Good chance he is in control of the alien arena though, a Mongul reference from War World
Who is the green figure with the energy blasts seen in Shifter's Strength?
Who is the space guy with the gun seen in Blackout?
We have two alien looking robots. The green one from KNYFE's engery burn and the blue on from Parse's Quick Calculation. Possible connection to the arena?
Parse is staring down a three headed t-res thing in the card with the arena. highly likely to be a target if the arena becomes an environment.
Questions and things I noticed :
Who is shooting at Tachyon in Quick Insight? It is obviously a jet, possibly military, but who does it belong to and why are they shooting?
Is the red glowing artifact in Ra's Excavation important? Does it connect to anything else (I didn't find anything obvious)?
Has anyone ever translated the flavor text for Living Conflagaration?
What or Who is Ra buring in Flame Spike?
Expat's incap side, the symbol for the Citizens of the Sun is drawn in blood, her's we assume, above her head. Signifigant and who would do it?
Vengeful Assault shows Blade holding a broken Staff of Ra.
There is a statue shown in both Fanatic's Consecrated ground and Apostate's corrupted Effigy. An effigy is the representation of a person and the flavor text states "These things you hold sacred are the worst of Falsehoods!"Possible that the statue represents a common link to their past? Lends credence to the idea that "angels" and "devils" are actually aliens or beings from another plane. Perhaps Atlateans as that would explain how humans have a false image of them ( a "corrupted effigy")
Are the street names important in Mistbound (Kirby st. and Timm blvd.)? If it is a comics reference I know of Jack Kirby, but I'm not familiar with a Timm. Clue to something?
The Matriarch in "Reveal Flaws" is definetly wearing a completely different outfit. Instead of her long dress she is wearing a skirt with boots. Her mask is now purple. Possible connection to the giant creature, or possibly an indication that she is no longer wearing the original mask but a different one. Strong possbility of her beomcing a hero, backed by other gathered evidence.
The flag in Iron Legacy's Rule from the Front is very similiar (to my eyes) to the flag in G.I. Bunker's card. Signifigance? The bunker flag seems like it would be a nazi flag but why would IL have that sort of flag. He beleives he is doing this for good.
Ermine's Impromptu Heist takes place in the Freedom Tower's Ironclad maintenance bay, you can see the other armors in the background.
Fright Trains rebuilt to Survive has some really interesting clues. The computer on the left has the Revocorp symbol on it and the orange goo they are pumping Train with looks very similiar to the stuff in the Chairman's perfect specimen vats. As well as the toxic vats found in the Industrial Complex.
How signifigant do you think the events of Parse's Data-mining are? Is this where Miss Information meets her end, or is this just the beginning. Considering above idea of what could be in the orange vats it could be intriguing.
A friend asked this and I realized I had no idea. What actually is the symbol of the Organization, has anyone ever figured it out?
Finally, I would like to re-post an idea I threw out somewhere else. The flavor text on Radioactivist speaks of someone wanting power, if this is directed at Unity it takes a dark twists when viewed along side the reference in "Caspit's Playground". Is it possible that Unity goes into a "I am God" phase at some point, or is the flavor text pointed towards someone else and Unity is just being goofy? The second seems most likely, but the first is interesting to consider.
Again, sorry for the incredibly long post