I wouldn't mind a more mature Zelda, aside from Wind Waker, they've steadly touched on more mature and adult (read: not violence and sex) topics since the leap into 3D (despite keeping the cartoony character models).
A FPS Zelda would really not surprise me, given that there hasn't been a major shake up to the Zelda formula in a while and Miyamoto is quite famous for taking franchises "to the next level".







