Right now, all next generation games are sort of in this limbo of "looking-better-than-current-gen-systems-but-not-as-good-as-you-think-they-should-look-so-there's-doubt-whether-it's-truly-next-gen" but yeah, it's unconfirmed, and it may change (who knows!), but if games are designated "next-gen" and look better than your best Xbox games, there's a very good chance they're probably Xbox 360 or PS3 titles.
After E3, everything will be definitive. Or more definitive, I hope.