Sony unveals a black Sony Rolly blinking and dancing loudspeaker.

Additionally Rolly owners can now customize the "arms" of their Rolly with different colors. I see already Japanese School girls sitting in a coffee and letting their customized Rollys battle on the table. To share cool Rolly moves, Sony setup the Motion Park site. The moves of the Rolly can be customized as well with the Motion Editor software.
Sony announced the Rolly music gadget last September.
Rolly only has a power button and a play button. All other functions are done by twisting or rolling the gadget. Measurements of the Sony Rolly are 104 × 65 × 65mm. The built-in flash memory is 1GB.
If you want a Rolly from Japan now, AudioCubes exports it for $499.99 internationally.

Rolly has been spotted at the FCC in the U.S., so a state side release of Rolly could be around the corner.
More details in this Sony press-release (Japanese). See also the Sony Rolly site (Japanese).