Sony announced the wacky Rolly music gadget in Japan on Monday. Japanese gadget exporter Audio Cubes started taking pre-orders for customers outside of Japan which is the only place the Rolly is offered.

Audio Cubes sells the Sony Rolly SEP-10BT for $449. Rolly starts to ship on September 29th.
Sony describes Rolly (SEP-10BT) as a combination of robot and sound technologies. Rolly offers users a new way of interacting with consumer electronics.
Rolly only has a power button and a play button. All other functions are done by twisting or rolling the gadget. For instance adjusting the volume on the Rolly is done by holding the unit and move it clockwise to increase and counterclockwise to decrease.

The measurements of Rolly are approximately 65mm in diameter, 104mm in length and the weight is approximately 300g.
As the Rolly is a Japanese market only product it comes with manual and software in Japanese.
More details on Audio Cubes.

The Sony Rolly has indeed some resemblance to the similar shaped ZMP Miuro iPod Speaker Robot, which is also available on Audio Cubes, but is much more expensive.