I like being able to run around quickly.. And for that reason, I'm getting the game. :3
As for the headbite, as Bubb said, it's looking pretty awesome.
Looks like the human campaign/multiplayer will be pretty scary. 0.o
Hopefully it's not too scary, otherwise I won't be able to handle it and I'll avoid it like I do with DOOM. D:
Hopefully they don't mess this game up, it's looking quite promising.