Sony on Tuesday announced the Japanese pricing and release dates for its two Walkman NX-X1000 series media players first introduced at the start of the year at CES. The NW-X1050, which has 16GB of built-in flash memory, will cost the equivalent of about $403, while the 32GB NW-X1060 will cost $503. Either will be available in red or black when they are released on April 25th.