There does seem to be a lot of Nintendo subsidiaries who have gone quiet. Just to go through some of the ones you guys didn't have time to mention:
AlphaDream - Of course, their most recent output was Bowser's Inside Story. Their repertoire seems to cover Mario & Luigi games and (unfortunately) Hamtaro stuff for Japan. I wouldn't expect another Mario and Luigi for a while, so they've probably gone back to churning out Hamtaro on DS.
Camelot Software - We know these guys are working on Golden Sun DS, though they appear to have their lips sealed on that matter. Assuming that the entire staff of Camelot isn't focused on this one DS title, I would estimate a golf game. To state the obvious, maybe a Mario Golf utilizing Wii MotionPlus.
Game Freak - Small correction: these guys are the Pokémon A team, not Creatures Inc. They've made all three main games each generation, and they're making Black and White. You may have gotten confused as Creatures Inc do have their hand in the Pokémon franchise.
Good-Feel Incorporated - This lot has little to show for their past work, but they did develop Wario Land: The Shake Dimension (Shake It! in the US), which is fantastic. Wishful thinking therefore dictates they would do a Yoshi's Island game for Wii using a beautiful hand-drawn art style like Wario Land. I'd love to believe they were given a project like that. Very improbable though.
Indieszero - Who knows with this studio? Their early work was extremely Japanese-centric and while they've had forays into the Western market, it was still obscure stuff. I'm afraid I'll have to be predictable and say they are either considering or attempting a localization for Game Center CX 2, or more likely they will continue to make everyday activity software.
Monster Games - Apparently, all this company has ever done is racing games, so it would be safe to bet on them working on something in that genre. Not necessarily in the Excite franchise; I don't think it's revival has been particularly successful.
Next Level Games - As far as I'm aware, Next Level aren't actually tied to Nintendo platforms in any way, although the development of the Mario Strikers series and Punch-Out!! suggests they have some sort of business partnership. They've expressed interest in a Punch-Out sequel with all new characters, so it remains to be seen if that was greenlit and there's a rumour about a Donkey Kong game...
Noise - I think you did mention Noise very briefly. Then again, there's not much to say about them. It's hard to believe they have been around since the Nintendo 64 days and only have a handful of games to their name. I'll be unimaginative and guess Custom Robo on Wii, unless the company has disbanded, which wouldn't surprise me given that they have said nothing for years.
Paon - If there is a Donkey Kong game in the pipeline, this developer is the other team I could potentially see behind it. They've made good and bad DK titles in the past, so if they are in charge of a new one, let's hope it's something creative and well-executed in the vein of Donkey Kong Jungle Climber.
That's most of the teams listed as a partner of Nintendo on Wikipedia. I just have one last thing to say about Project Sora. I don't think Masahiro Sakurai had in mind what he wanted to do when he formed his own development house. The fact that it's funded by Nintendo and the phrase "A new experiment for Mr Sakurai" tells me that he is receiving money just to try things and see if they work.