OK, I did some research on my own: It is called the BK-7m. This french site has some information:

http://www.audiokeys.net/forum/showthread.php/26169-NAMM-2011-ROLAND-BK-7m-Module-d-accompagnement

A quick Google translation gives us:

- Module accompanying ultra compact MIDI compatible instruments like pianos, accordions, organs or keyboards
- Over 1,000 sounds, 57 drum kits, 128-voice polyphony
- More than 400 musical styles each with 4 memories "One Touch"
- More than 900 registrations Music Assistant for a large repertoire
- Playback SMF and audio directly from USB port
- Audio files in WAV format on a USB connected
- Function "Cover" for SMF and musical styles
- Composite video output for display

The full details will probably be available in 4 hours on the Roland Connect site:

http://www.rolandconnect.com/