Sony Rolly SEP-10BT "Sound Entertainment Player" is here, people, and yet we're still just as unclear as ever as to exactly what it's utility is. Not quite a domestic robot, not quite a portable audio player, not quite a boombox, the Rolly flutters about, dancing and playing MP3, ATRAC, or AAC tunes via either Bluetooth with A2DP / AVRCP or its 1GB of internal memory. In fact, not only does Rolly dance to your music, apparently you can also choreograph it and share your Rolly moves with pals over the internet. A full charge gets you five hours straight music, four hours of dance and music, or three and a half hours dancing, music, and Bluetooth use together -- fantastic news for people with a clean desk and tons of time to kill. It'll run you about ¥40,000 (about $350 US) when it lands in Japan September 29th. Video after the break.