I haven't seen a thread like this yet and I'm curious/bored.
Since the game is pretty much a given at this point, what would you like from it?
I'm hoping the game has more than six original campaigns - it seems like it's been in development for a longer time than either of its predecessors...
Recently I've been attempting to write a theory about what could possibly be going on with Half Life 3, and what content the game might consist of when it comes out - I've spent a few weeks researching and I think I've managed to hit on something pretty likely, but an important part of my guess...