Wave Race will come Mario, an FPS is more important right now.
And I haven't played Metroid Prime: Hunters, but it isn't generic. I've played the demo, and that's fine. And everything about it (while not as unique as MP) is well made, visually and gameplay-wise, just more similar to Western FPS games.
And supposedly it's really good, as an FPS, so if we get a non-Metroid FPS from NST, on Wii no less, that's great news.