You know, I have to admit, that the ideas you made up are absolutely astounding. The idea of gyros and moving your arms around to simulate ingame actions is damn brilliant. Climbing ladders, the Icarus bow, etc. A controller with two separate parts? Absolutely mind numbingly brilliant and I must admit it would tie in greatly with Nintendo's "look at the DS" model. Particularly I love the idea of two handed movement for FPS games. I personally despise control methods for those, but I love gun games, and I feel that I would be a much better player if I had some sort of light gun-like controler. It even brings in the idea of 3D/virtual reality gaming a bit closer, but without going overboard. The Nintendo ON video was a nice idea and all, but it's not practical because no one has the needed space to move around in for a game environment, and also the player cannot replicate the moves of the game character (who in the hell can jump like Mario?).
I mean, it could be taken a bit further, but I only have one idea. And this is a little thing but I'll mention it anyway. With RPGs, given that the game is less action oriented, sometimes I'd like to be able to control it just with one hand (use the other for snacks, etc). So this would be quite possible with this setup - the left one could have the buttons assignable, so you could perform execute/cancel commands easily and move around. It's not revolutionary by any means (the PSOne had controllers like this, I think the SNES might have also), but it's still something else that could be factored in.
In fact, having seen this controller, I am going to very pissed if Nintendo's isn't at least as amazing, in terms of control, as this one is. This goes above and beyond anything on controller interfaces yet seen. It's almost like the transition from 2D to 3D. Where Microsoft and Sony would be stuck in thinking of a stationary 2 handed controller approach, this idea would absolutely floor them in terms of fluid design and mechanics.
I must admit, very impressive. I can only hope the Rev's controller is half as engaging as this.