While we wait though, they should really come out with some filler games. Prime Trilogy HD is pretty much a must at this point, hopefully it'll release either this year or next year. Beyond that, maybe they could get MercurySteam to work on another 2D game?
Okay, here's Federation Force 2 for you.
Jokes aside, the next logical step would seem to be either a Super or Fusion remake. I'd of course prefer an entirely new game, taking place after Fusion, though.
Personally though, while I like 2D Metroid titles, they just don't compare to Prime. It wouldn't be much of a holdover for me.
You know, now that I think about it, I'm actually kind of considering buying Federation Force now. Didn't see much of a need to before, because I saw it as an indication that Prime 4 was coming soon. Perhaps it might help tide me over, even if only just a little. Wonder if I can buy it used for cheap yet.
They were clearly making the sequel of Other M by accident.
It was Ather F.
In all seriousness, I wonder if they accidentally ended up making something that felt more like Other M in play-style than Prime, and when Nintendo realized this, knowing the fanbase's opinion on Other M, they decided they needed to start over with a different studio.
If that was somehow the case, as unlikely as it is, then I kind of hope that they end up using its already made assets to create a new story under a different title, unrelated to the Prime Trilogy. I'd be down for another Other M styled game, especially if it cleaned up things from the first. It would certainly be less wasteful than trashing the game altogether, and we'd get an extra Metroid game out of the deal.