Returning MAJOR Characters(Mr. Wile, Loggo fit anteater and the snow man don't count) : Banjo, Kazooie, Klungo, Mumbo Jumbo, Grunty Winkybunion, Humba Wumba, Tooty/Brentilda/Googly eyed vegetables, Jolly Roger, Mr. Patch, Weldar, . There may be more but I think that I got them all. Oh wait, Jinjos, King Jingaling and Bottles.
New Characters: Lord of Games (Log), Grunty's new sidekick, Trophy Thomas (possibly Grunty's sidekick), Pickelet, and Piddle (more to be announced hopefully)
Hub World: Showdown Town. appears to be a very large sity where banjo can explore and enter levels (In my opinion sounds similar to Delfino Plaza from Mario Sunshine) Said to be 16 times larger than any hub made by rare.
Game Style: Platformer/racing (multiplayer)/CMS
Main villian: Unknown, however both Grunty and LOG appear to be antagonistic
Release date: Unknown
General Facts: Said to be 80 percent vehicular.
All of kazooies moves gone
might be fully orchestrated
All characters roles changed in some way
All characters appearances changed in some way
Kazooie lost her attitude :(
Bottles got divorced
only fo 360
Well thats all for now. I hope that this helped to answer questions for all of you few remaining Banjo fans out there. (I don't think I am the only one left)