They do tend to knock out prototypes like this, but I doubt we'll see that bike in it's present form though a single motor version might just appear. They do tend to suddenly abandon markets at times though, so any appearance could be brief.
They had the original PAS model at the start of this decade and it was sold in Britain for a while until they suddenly withdrew in the face of the superior Panasonic system, though later Yamaha models continued on sale for longer in mainland Europe.
Here's the original PAS Easy model: