Just a heads up to anyone interested in Backbone: It's pretty bad. Great first act, goes completely off the rails the rest of the way. Choices don't matter. Trailers show off stealth that is hardly ever used. Sound mix was uneven when I played at launch (might have been fixed since). Dialogue is fairly good, though. Art style is gorgeous, too.
Normally I'd recommend playing the demo first to see for yourself but I can't even do that because the demo is so completely unlike everything that follows afterward.