As pointed out, he works for EA, not ID
and as far as I can tell, he does have legs (and apparently a sense of humor 8)
they had a cover story in PC Gamer a few months ago, with a conference of a bunch of game makers, and he is standing on the cover with 3 other people. but every other picture I've seen of him have been from the waist up, and the cover picture is blurred out in shadows for the most part.
But I'd guess he does have legs