My curiosity has been peeked by this expensive beauty and I haven't been able to find out much beyond the typical Yamaha propaganda here:
http://www.yamahaclavinova.com/cvp/cvp_feat_200/cvp900fe.htm#dss

But 256 notes of polyphony! Color display screen. And the rest of the features/specs look really nice for a 250 lb. home arranger. And I have just the right spot for it in my living room! It was debuted at Winter Namm this past year and I've heard that the MSRP is around $12k. Anyone know more?