Call it the "me too!" and I'll buy it on principle.
Argh ! Buy a Wii for a Wii. Why take a more expensive imitation.
While I love Wii's philosophy, it is also not ideal as a UI tool (yet ?). I have problems keeping the pointer within the screen boundary. As a UI tool, I have trouble pinning gestures or a 3D pointer to small on-screen objects/areas (As a game, it may be fine). The mouse works great because it slides on an assisted/2D surface to achieve great precision, and my arm is not strained. The tablet and a handheld touchscreen are handy also.
The Toshiba UI is trying to use gesture like a mouse, which may be clumsy. We can easily choose 5 different contextual actions (because one hand has 5 fingers) -- without resorting to mouse-like tracking exercise.
For motion sensing activities, I prefer interactions like WiiSports, High Velocity Bowling (PSN game), and the "Stop" gesture in the above demo. They are intuitive and simple; not affected by screen size.
The rumored PS3 controller sounds like a multi-piece VR tool. I hope it doesn't force us to do fine grained mouse-like movements here. If it does, it should be like in Minority Report, where the UI elements follow the hands automatically, rather than the hands follow the UI windows.
For games, well... anything goes as long as it's fun.