No, really. At the very least an obscure cameo. And speaking of obscure cameos, I think that Samus should show up at least oce.
Oh HECK yes. And if he was in his transformed state, think of what his wings would look like! Scratch that, his ATTACKS! *-* Marx...though...has he in been in any other games aside from KKS? I hope that the Kirby team hasn't forgotten about him, if so...
I agree with Kirbykid, I think Meta-Knight (what's the proper way to write his name out, anyway? o_o) should be a bad guy, but not necessarily the main villain. Sort of like in KSS, RoMK. He WAS the antagonist there, but not for the entire Kirby series in the pack. Just one little game. I don't know how they'd do that for THIS particular style of game, though...
Abilities: Wing, Jet, Mirror, Beam, Ninja, Mike, Cook and Suplex/Backdrop. Most-wanted, anyway. As well as Plasma being ACTUAL Plasma and not a ripoff of Spark (though from what I've seen, it appears to be genuine Plasma. :3). And the partners from KSS that accompany those. And Poppy. I'd like to see Rocky instead of Golem, but apparently that's not happening...plus, I don't like the way the new Bomb and Stone cap look. I could be wrong, maybe I'm just not watching the preview right, but the Bomb cap...shouldn't look like a party hat. I'm going to miss the blue-and-white one if it doesn't make it in. That, and the Stone cap because although it was really weird-looking...it was awesome. @w@
KSS-style partners, yes, where hopefully all four players can play at the same time. I'm not sure if this has been confirmed or not, though. And I also don't know how Kirby would manage that...suck up a Chilly, make a partner, suck up a Golem, make a partner, suck up a Plasma Whisp, make a partner...?
I'd also like all of Kirby's animal friends including Gooey to come back in some way where you at LEAST see them in their actual form - not cut out of stone like in K64. Adaleine, too, because I like the way she looked in K64. ^-^
I'd like to hear some already-existing music, such as the Dedede battle theme and Kirby's main theme. It would be nice if some KSS tunes were included as well, but that's probably not going to happen for many reasons (I can dream, can't I? :D). Yeah, obviously I'm a big fan of KSS. But no matter what they do for the music, though, I hope it's as good as every game that's been leading up to it.