I'm not too impressed with the idea of Fire Emblem Wii. Mainly because we know nothing about the mechanics (hell... all we saw were a couple CGI mini-clips). If it uses the Fire Emblem interface (turn based), I don't see how the Wii controller would be worthwhile. Unless when you attack an enemy you "actually" fight it and can block their attacks. Hey, that's an idea.
I'm still most excited about the sports games, since they showed those in the most detail and they looked simple yet fun (good party games). Red Steel's sword combat was also pretty awesome, due simply to the fact that you could do literally every sword combo imaginable (blocking AND swinging wise).
Yoshi's Island 2... wondering how the DS will incorporate the touch screen. My guess is shooting the eggs on it and such.
Starfox DS... looked damned good, especially because I saw no LAND or ON FOOT missions, only planes. Starfox oh starfox.
B: There were tons of Metroid Prime 3 details. Well, "tons." They showed quite a bit of footage. Looks very... Metroid Primey. Only Wii-ed.