OK, I was wrong. I guess it does have speakers. There is no mention whatsoever of the speakers on
www.priviapiano.com, but on the casio.com link Squeak provided above, it says: "Powerful 2-way bass reflex speakers provide high-quality professional–level sound." But there's still no mention of the speakers on the specs page. We don't know the size or wattage of these speakers.
I will say that if they use the same speaker system as on the PX-555R, it's not going to make it. Side by side against a Yamaha DGX, the 555R sounds sickly -- and it's 80% a speaker issue.
But I hope they keep trying. Competition is good for everybody.
R.