It showed up at Sweetwater on the first day of NAMM. However.., they still don't have a price listed on their site. I haven't been able to play this model.., but fortunately the guy who has been posting many of the 7500 demos on YouTube has personally sent me MP3's of this new model.
I have to be honest too. I still think the ZPI sound set is much better than these current models. What really troubled me was the VERY obvious loop points on some of the sounds. On a few saxes.., when a note was held or sustained that loop point smacked you in the face.
Feature wise these new models IMO are loaded for the price. Granted the sound quality isn't up to par with the old MZ-2000.., but for the price I still think they're on hell of a bargain. If the 7500 is going for $499 that means the 7000 is going to really be a good bang for your buck.
If I had one of these units.., I'd be utilizing every part of the tone and DSP editing to clean it up a bit.
Plus.., as we all know.., even if the sounds aren't top notch.., when placed under skilled hands a WK-7500 could sound very good.