I want to say White Knight Chronicles: IE, however it won't even come close to wining anything, since its an underdog exclusive game of those.
To be honest, i agree with pretty much everything numonex stated in his post, from PS3's insanely popular games, to halo: reach selling the most this year (on HD consoles) all the way down to FFXIII not impressing as much as the above mentioned.
I hope WKC: IE atleast wins best JRPG on PS3 though.
one things for sure, it will win best game no won played.