I saw the models in person finally tonight at Gamer's Haven in the Springs. They definitely are too big for playing in conjunction with Adeptus Titanicus. That being said, I don't know how you'd run the two games combined--AI uses hex movement and AT doesn't, and AT needs ground terrain, whereas that would just interfere with movement for AI.
All that being said...the models are DANG COOL. The Thunderbolts look sweet, and the level of detail, especially for the scale, is just this side of insane.
I want to give the game a try before I consider buying it--want to see how it plays. I also want to wait a bit and see how GW fleshes it out. I'm hearing that it will be fully supported and that they're going to release flyers for just about all the factions, so I'm cautiously optimistic. I also want to see what aftermarket accessories come out, specifically game mats...AI uses a 2" hex grid, which I don't think is very common, so it'll be interesting to see if a company like Tablewar releases AI-specific mats.
At a bare minimum I'll likely buy some of the models to paint. Because I really need more models to paint.