You've no doubt seen the teaser photo and press release for Casio's new Privia PX5S.
You'd be understandably be forgiven for maybe passing it over in search of more obvious synth stuff, but its worth a look.
The power of the synth engine gives you 256 voices - with four HEX layer voices (6 layers, effects filter), you also get the Privia piano voices and 88 key Tri-sensor, Scaled Hammer Action II. There's also the MIDI controller aspect, with four zones, which can also work over the MIDI ports OR the USB port separately, means you can control some iPad or laptop based voices in addition to the 256 you have on board.
A few other nice touches complete the package, and from what I heard in the flesh the sound is pretty impressive.