Time for Metroid Prime 2 hype!

Will it have the same harsh timing requirements as the 2D games? You say she can basically hover indefinately, but the correct phrase is she can theoretically hover indefinately, because in fact, it is very difficult to pull off, unless you can find a nice, inert wall to hover beside.

Also, why does there need to be multi-jump for the screw attack? In Metroid II, the screw attack was just as deadly without spacejump; the only real reason the two needed to go together was to escape the un-screw-attackable metroids, speaking of which, will you still be invulnerable while screw-attacking?

As far as I'm aware, yeah, you're still invulnerable. It still requires the timing to pull of the multi-jump as well.

As for why they combined them, it would be pointless to include the Screw Attack into a Metroid Prime game without the multi-jump attached to it. Doing so would create a gameplay mechanic in which the view would pull out into a 3rd-person perspective every time Samus jumps, as opposed to just pulling the view out for when she activates the multi-jump. It would be too disorienting.

Just thinking about it, it seems to me like the game would be better if it was completely third person.

...obviously you've never played Metroid Prime. If you had, you wouldn't have said such a thing.