The cup holder will be a Blueray drive. But since it's a slot drive without a tray, the cup holder comes as a little plate of metal that you stick into the drive for that purpose. When not in use as a cup holder, the plate can be folded into a stylish robust case for the RX-71. Since it's magnetic, you can also stick it to your fridge.
But to be able to play Blueray discs while using the cup holder, Nokia registered a patent for placing a disc into a hole in the holder so that you can put the disc together with the holder into the drive and the holder will sort of work like a caddy (somebody still remember the old CD-ROM drive with caddy for the Amiga 500? ).
Nokia will show the device on a press conference on April 1st.