New Chrono Game? Hm, let me see...
Kato's brain
Mitsuda's music
Magus (playable or not)
Schala Kid (definetly not playable)
A decent end for Harle (if she's still alive)
Nirvana Strike (no matter how, why, when or by whom)
Totally new playable characters (like what CC was for CT)
Action RPG (I prefer that style, like in "The Legend of Zelda", rather than the CT/CC battles)
Even more intricate story
Neo Epoch/Any flying and submersible vehicle capable of time, dimensional and space travels (oooh deep space)
Hmm, yeah, that's it for now... well, a man can dream. ^^