On the 2nd video (playback), not sure I'd like how when you switch between photos it's slightly zoomed out with borders, and then after a second it snaps up to full size on the screen. I'm all for making things look pretty and smooth when you can, but that would just bug the S___ out of me.
Only thing I can see this useful for on my 5d3 would be to pan around a heavily zoomed in image. Otherwise, not so much. Overall, at least at this time, I'd take a pass so I'm glad they didn't put this on the 5d3/1dx.