I myself can't wait to get a few of these as soon as they hit the shelves
The possibilities are beyond imagination for now until we get our grubby mitts on them for real.
I REALLY hope they allow enough room for saves, this was my biggest problem with the Wii. I have two kids and they both have a Wii and a main one in the living room. The constant juggling of my daughters saves (all big 120+ block games) was obviously a problem early on and was a real pita...yes with original bought games it never took long to run out of room.
The HD was needed, but imho graphics are low on the list.
Playability is gonna be great with the new interaction and I myself can't wait to write some basic homebrew apps once it's hacked as I've spent a long time making a web server at home that works with the psp and ds for portability and the Wiis and pcs for on a big screen and allows all sorts of cool things, but is now made obsolete with this. I wasted my time, but am smiling so hard...
One thing I'm worried about is that I've not saw any mention of the GameCube...it will work with all my Wii stuff, but what about all my GC stuff...
Drums, dancemat, steering wheels, wavebirds etc Seems it's not going to support these, well officially
This might be good if....soz...when it gets hacked if we can take GC to it too, but we wont get use of the controllers etc, which I personaly liked but suggests to me that the quality GC games will be remade and resold to us all, I bet I need to rebuy some Mario games from back in the days of NES that have been remade and sold to me over and over for hundreds of pounds over the years.
I've also not seen much mention of the DS/i/3DS and how that will come into play.
Overall, imho it looks fooooking amazing and the possibilities are enormous. Lets hope they lack proper security and we get Mario War type homebrew taking advantage of the epic control system, a GC loader...from HDD
and a WiiUMc that can easily be ported over and built on top of.
Homebrew on this thing could be jaw droppingly full of features and I'm sure some devs will blow our minds.
*EDIT*
Oh and the slab in the hands having a built in accelerometer scares me