It is interesting that on the Japanese Casio site

http://casio.jp/emi/products/high_grade/

they only list CTK-7000 (the 61-key version), as well as WK-6500 and CTK-6000, but not WK-7500. The release date given there for CTK-7000 is 10/2010. Looks like they've changed their mind and WK-7500 will not be released at the same time. The price given there for CTK-7000 is 63,000 yen (or 66,150 with taxes), which is roughly $750, however, a few sites offer it for 49,800 yen (or ~$600). For instance,

http://www.yodobashi.com/ec/product/100000001001267238/index.html

http://store.shopping.yahoo.co.jp/kurosawa-music/casio-ctk7000.html

http://www.kurosawagakki.com/items/detail/97580.html

http://www.ishibashi-webshop.jp/shop/g/g421026200/


http://www.coneco.net/PriceList.asp?COM_ID=1100904002


http://www.soundhouse.co.jp/shop/ProductDetail.asp?Item=225%5ECTK7000%5E%5E


These sites also give the release date as late October. If I remember correctly, at these same sites WK-7500 was also listed a few days ago (don't remember the price, though), but it seems it has been removed since.

[This message has been edited by MChub (edited 09-17-2010).]