I cannot see these new Casio's going for over $800.00 here in the USA. Mainly because for less you could probably find an MZ-2000 (possibly new or very close to new). The new WK's are nice, but the MZ-2000 still has quite a few features over the WK's such as full voice editing, 16 track (40,000 note) sequencing. 22,000 note capacity for style recording, 15 watt speakers, initial and aftertouch, style conversion, way better drawbars with slider control, mic/line input jack with effects, better screen, ect.
The new WK's may have slightly improved sounds and 32mb's of flash, but I can't see that justifying a price jump of over $400.00 from one model to the next. The WK price history doesn't support this. I estimate the price to be between $450.00-$500.00
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.