Also an interesting step up in controllers - for those new to it, here's another marketing vid to give an idea of the potential uses of it:
I can see lots of fun from this, especially as a really controllable sword or bow. Though Wii Motion Plus does some of that, this can keep track of your position in real space which gives a few more options and a lot more accuracy.
Combined with the PS3's graphical power, could really make an impact?
A step up from the Wii's motion plus, more control, more accuracy?
Too similar to the Wii to catch people's attention when compared to Natal?