I am so sad to have gotten the Greater than Games update this mronign in regards to Vengeance. I recently got turned onto Sentinels of the Multiveser right before the holidays and became obsessed. I literally can NOT speak any more highly of this game to everyone I meet since I just fawn over it. As soon as I got hooked I instantly ordered every single thing I could from the master game to all expansions to even things like extra tokens and as many of the promos as I could find outside of some of the earlier rediculous priced ones. Had I discovered Sentinels of the Multiverse earlier, I would have instantly dropped the money to support Vengeance and been a part of the pre-order list, but now I searched everywhere (including even eBay) to see if I can order one and found right now it is impossible. I wish there was some way to order myself a copy, but have run out of options and have to come to terms with that. I am so sad to miss out on the first run of this set as well as those two promos but am happy for all of you who made the kickstarter/pre-order list and will get it in your hands in only a few weeks time.
Vengeance Makes me so sad
You can buy if from GtG, or your FLGS, after its shipped to backers and pre-orders.
You may not get the promos, but GtG is going to be shipping the Vengeance copies in this order: Kickstarter Backers, then Preorders, then Retailers/their own site.
I'm fairly confident you can expect to see Vengeance in stores and on the GtG Store by late February, once all the backers/preorders are sent. So don't be so glum! As for the promos, if you really want them, I'm sure some people will be selling them on eBay soon (if history is any indicator). Some would rather make a small profit on the promo cards rather than keep them.
Also, if you ever go to gaming conventions, you can play Sentinels and get points to buy Promo cards (or just get them for a couple of bucks). And if you don't go to conventions, the promos tend to show up on Board Game Geek as image files for you to print out.
There's always some promos on eBay. The Dark Watch ones aren't hard to get, it's the older one that are.
Don't worry, we have printed *way* more copies of Vengeance than are spoken for via Kickstarter and pre-orders. You'll definitely be able to pick yourself up a copy from a variety of different locations!
Well I will cretainly keep my eyes open as it gets released to try to pick a copy up as soon as possible. Now that I'm aware of Sentinels, I have every intention of continuing to get everything I can get my hands on.
That's exactly how I felt. I got into Sentinels shortly after Shattered Timelines released, so I missed out on a bunch of promos and the Vengeance kickstarter.
"Never again!" I screamed to the stars, fists raised in the air like a madman.
I preordered Vengeance as soon as it was available and have had my eye on the GtG site ever since; waiting to jump on any opportunity that strikes.
Do you semi-officially kinda-agree with the probably-late-February ETA, then?
Would LOVE to see an answer to this… 
"Late February or early March," he said, semi-officially.
Also, if you haven't done so already, you can print out copies of the promo cards from BGG and add them to your game