Graphics are astounding, but NOT groundbreaking. Uncharted 2 & 3 already delivered us that sort of graphics, even other games have showed use that sort of power (or MORE), such as God of War 3 and Final Fantasy XIII/XIII-2, to mention a few. That's not something bad at all, after all, as said, the graphics are fucking gorgeous, but we've seen that before, and fact is, nowadays we are STILL seeing really crappy stuff lying around.
As for the enemies... That's what keeps my hopes really low for this game. I mean, "zombies", AGAIN... WOW, I mean, they're NOT zombies, they are "crazed up people infected by a fungal virus", so they don't eat human flesh and might not be UNdead, but as far as it matters for a game, they seem to run at you in unquenchable rage, like ZOMBIES; let's face it, they ARE zombies, a variation much closer to real life "zombies" (people who are laid in a catatonic coma, then deprived of oxygen for a certain amount of time: the damage to the brain renders the person a real "zombie", almost as if going through lobotomy, etc), but zombies anyway. The Walking Dead, in my opinion, only works because the zombies are mere mechanical elements to drive a much bigger DRAMA story, but that hardly works in games (unless it's an adventure game, like The Walking Dead itself), maybe because it wouldn't sell to help people keep a farm hahaha.
I think the game will SELL well. If people will actually like it or not I don't know. For one, I don't dare mention if I'm gonna enjoy it or not, so far it looks mediocre in comparison to games we already have, that means it doesn't look astounding, but doesn't look half-bad either. Time will tell...
