Looks like it's a technology for people enjoying slow ghosting so far:
https://www.youtube.com/watch?v=RihG5EzuU9M
The product is not fully ready, but it does not look very promising. The colours are muted, everything is painfully slow to update and flashes several times and the ghosting is out of this world.
Maybe Pocketbook can do better, but the technological limitations seem hard to overcome.