Damn. With all the Order:1886 hype going on I briefly managed to forget my excitement for this game. Now it's back with a vengeance. I remember reading somewhere that Suckerpunch will do some panels at this year's GDC about their engine, so that will be interesting to see also.
Smoke and Neon are the only ones that have been shown, but there will be more powers. SP is keeping them a secret. I think we won't see any more powers until release maybe except for a quick glimpse of another one in the launch trailer.