most likely episode 3 coming out but im not too fussed, seen as half life 2 and both subsequent episodes were really same-y i.e. poor lighting, a terribly controlled car section that lasts for hours on end, and a lack of an aiming feature which for an fps is a bit tricky, especially at some points in the game that made you shoot from long distance and bullets were spraying everywhere because you can only aim from the hip.
the biggest surprise they could announce is that in episode 3 Gordon is going to actually say something, like the fact every encounter with the resistance you get to they are all *oh noes a 40ft robot is heading our way* and alyx is all *gordon will do it, gordon just loves to do it dont you gordon* i would love for him to turn round and say *no *****, stop sending me on these suicide missions and do it your damn-self, im going home iv not eaten in months...*