I can see that being the slimmest digital piano is something that can be said in promotion, but I'm not sure if it changes a lot in a real life, apart of speakers being faced to a wall.

So far I have doubts if there will be a PX-560 successor, in some way we can consider that PX-S3000 is actually to replace it. I speculate that PX-560 didn't sell very well. It had (has) to compete with Yamaha DGX-660, which is to me less interesting, but sells pretty well - right now here it costs less than PX-560 and comes with a stand. I assume that Casio tried to learn the lesson, realized, that an average customer has different expectations from a portable keyboard and a digital piano and is not ready to have both in one package.

Now Casio offers digital pianos as a stylish thing for home, which won't steal much place and doesn't suggest that you have to be a computer engineer to operate it. But for those who really wants to be productive, to play it on gigs - it is much less useful.