i think Casio is testing the waters with the MZ x500 to see the reaction which may lead to their vision of making a more TOTl arranger/workstation to rival Tyros/Pa4x/Audya/BK9 etc,.....
we'll see soon enough..or it could be a total flop I hope not.
Its in the makes...
It has 88 keys and combines px-5s with The XW synth and the MZ-X, and them some more ...
It will be promoted at the Musik Messe..and in shops around the world this summer..