If they want to continue filling gaps with GC remasters every now and then, then the answer is NEVER

Or they could remaster those sweet freaking Wii games that never released worldwide for whatever reason.

Super Mario 2D World

I really hope that is not the answer, because I've been waiting for GameCube games on the Virtual Console since the Wiiu was announced!

You mean these? Which would you suggest? Back then I mentioned PZ4, Takt of Magic, Zangeki no Reginleiv and Kiki Trick.

Dragon Quest, and Fatal Frame would be two big ones that the World is familiar with and would love to have released Worldwide. You also got 5 above that at least warranted mentioning.

It will never be MM, it needs to be a remake, not a remaster. Nintendo already have their remake engine used in Ocarina of Time, so MM will be release on 3DS with the engine. Additionally, I don't think Nintendo will remaster Wii games, because Wii U can run it.

So, if they release their new remaster title, I'm sure it is a GC game, like Zelda WW. Mario Sunshine maybe.

I'd prefer New Super Mario 3D Galaxy, a game based in the series of Sunshine.

Wii U can run Wii games, but not all Wii games were released everywhere. This brings incentive for an architecture the Wii U is already made to support.

If Project Zero U (Fatal Frame) does come to the west, there could be a chance for some bundling similar to Bayonetta or a eShop release.