I'm constantly 'wowed' by this screenshot.

[SirMcNugget]

are the combine going to attack us streight away or am I going to have to piss them off first?

Interesting idea, maybe the game starts off with you doing a mission for the G-Man somewhere which results in you making the combine mad who come to earth to wipe it out. I doubt that is accurate but I mean this concept art assures me that the story will be pretty freaky and amazing.