I've seen some videos on youtube from namm where people like Ola did a quick run down with desk monitors. The sound was OK. We should definitely wait a bit for something more professional. Funnily enough, the unit has not even had a single sound bite recorded or demo-ed and the first batch has already sold out. The second batch should be out in like... November :_)
The one thing I disliked about the unit already was poor button placement, to me the layout is too narrow and tight for live use.
Another thing to consider would be - it is a floor unit and I'd be super anxious about the touch screen getting damaged playing live in not nearly as perfect condition.
The good thing is, there's no USB and everything can be done via wireless. You log into your own account from say a rehearsal space that does not have a PC, so downloading your sounds while being onstage suddenly is quite an option.
This could be interesting for players who normally gig without any gear, just with a USB stick and say a rented kemper.