OK here are my predictions so far based on the rumors
-comes with a controller that looks similar to NGP but more comfortable with better grip, (like that 01net mock up)
-the controller screen size is 6", it is low res, and only has single touch
-a WiiMote also comes with the console, it is the same WiiMote as the original, your old WiiMotes work too
-does NOT stream full games on controller screen, the only thing it does without the need for TV, is check messages/updates, stream video, minigames/ipad type games/casual games, download from store and etc
-backwards compatible with Wii games
-more powerful than 360
screen on the controller can be used for
-multiplayer splitscreen gaming, being able to hide things from opponent, such as Maro Kart item, FIFA/Madden team tactics
-minigames, while not having the TV on, so small iPad type games like boardgames, casual games and etc.
-extra screen for map, inventory and etc
-touch screen can be used as an extra input or trackpad, for example drawing stuff on the tv by using touchscreen (could work on a game like Okami)
-touchscreen could be used to check messages, friends, downloads and etc without exiting game, hell you could do this stuff without the TV on.
-touchscreen could be used as a keypad for messaging, or a trackpad for surfing the web