If this is real, it's impressive. The speed even seems decent for an early version. I guess there's no sound though.
They'll also have to contend with games that require both screens for action, such as Sonic Rush, Yoshi's Island DS, and Dragon Quest 4/5.
I'm not sure how plausible this is, but maybe an option to tilt a widescreen TV in portrait mode and stretch both screens vertically. I'll admit I have NO clue how this is done, and it might be impossible to do with the Wii's hardware. So sorry if it's a bogus idea. At any rate, it would seem a plethora of screen orientation options would be nice. The way FFCC Echoes did would be nice- side by side with an option to resize it on the fly. Or when the bottom or top screen aren't even needed, have an option to disable it with a simple button press.
Still taking this with a grain of salt. Could be completely fake. Who knows?