We have some interesting stuff for you. First is a high quality Shounen Jump magazine scan from FF13 vids. In it, there's some pics of the new secret ending (which has redone and new scenes), pics of the new Theater Mode (where you can re-watch the cutscenes) and Puzzle Mode (a game that involves the Crown Search), and two pics of the new armored knight secret boss fight! (The middle armored knight we see in Sunset Horizons) It should be noted that he's labeled as T.E.S. ("The Enigmatic Soldier"), has 17 health bars, is stronger than Sephiroth, and he has some ability in which he can enlarge his keyblade greatly and "surf" it (as reported).
Also, we now have:
FM Menu Screen (The pic can be seen better HERE)
EDIT: A pic of a supposedly new accessory was found. Apparently, Sora gets to WEAR a crown! It's unknown as to how you can get it, and people have speculated that it involves the Crown Search mini-game. However, a report of the new armored boss states that Sora gets something on his head after beating him...
That's all for now!
Source: kh-2.net, FF13 vids and Maiki's Live Journal (Go there to get an idea of how strong some of the optional bosses are!)