The latest release of Sony Rolly is about the compatibility via bluetooth which you can control the dance with your bluetooth-enabled cell phone. You can also control it via your laptop using Sony Rolly dedicated software.
You can program yourself the dancing movement using the software, and controlling up to 4 Sony Rolly (may be more!) to do a group dance, watch the following video to find the funny side of this new bluetooth-enabled Sony Rolly SEP-50BT Dancing portable media player:
Sony Rolly SEP-50BT Dancing PMP will be available first in Japan on this November 21st. The price is estimated to be around $420 (¥40,000).
Existing owner of Sony Rolly have no need to buy the new version. There will be a software and firmware update this December for the old version for a couple of bucks.