It's been backordered for months from day one. It's been out for about a month or so but good luck getting your hands on one anytime soon if you didn't preorder. The only somewhat detailed info really out there atm is here:
http://www.axiss.co.jp/Ayre/whatsnew_Ayre_KX-R.htm
http://www.axiss.co.jp/Ayre/whatsnew_Ayre_KX-R.htm