LexusRX330

The back inside cover of the latest Lexus magazine has an advertisement for the Rear Seat Entertainment System for the LX470. The ad states the system will play MP3 music discs. Does the system in the RX330 also play MP3 discs? If so, can the sound be directed to the normal stereo speakers while the car is moving? I really don't need the RSES since 99% of the time I would be driving alone but if I could play MP3s and control the player from the driver's seat, it may be an option I would like to have.