We only saw it properly unveiled about a week ago. Same could be said for Graces too, even if it was heavily hinted at for at least a week prior.
I don't think that's enough a reason. We already saw some gameplay in the TGS trailer (which clearly indicated that the game is similar to its predecessor), and the Project Dark website said it was coming out in 2011 for both consoles. You have Skyrim on the list, which we haven't seen a single gameplay vid of. Just a few in-game pics and bits of info.
What about Mass Effect 3? Not a single in-game shot. A teaser showing no gameplay whatsoever qualifies as a proper unveil, but one showing some actual gameplay doesn't? Strange. And Graces' situation is not even remotely similar.
Anyways, Dark Souls qualifies based on its pedigree alone, but not everyone shares my tastes in RPGs, which is completely normal. It's your list after all, not mine.