Unfortunately, there’s no high-res version of this video to make it clearer what’s going on.
But to me it looks like they’ve created a UI in which it’s possible to have at least four eBooks open at the same time and to switch between them via tabs.
I’ve asked at YouTube if that is what’s happening. I also asked if it could done with PDFs.
This could be major.
Previously here:
Video: Likebook Mars Playing Video
Video: Interesting Review of Likebook Mars
Likebook Mars Via Amazon: What?
Video: Likebook Mars Versus Likebook Muses
Likebook Muses: An Upgraded Likebook Mars
Likebook Mars Firmware Update
Google Books PDF On The Likebook Mars, Part Two
Google Books PDF On The Likebook Mars
Boyue Likebook Mars: An “eInk iPad Mini”