Toshiba announced in Japan the Gigabeat P5S series branded with the NANA Manga. So NANA is not a play on Apple's nano, but maybe Apple's lawyers are going to think differently about it.
There are going to be four Gigabeat P5S in different colors available. The NANA branded P5S will have 512MB storage.Toshiba will release the NANA Gigabeat players in July and August.
The standard Gigabeat P5S music players have been introduced in April.
More details in this Toshiba press-release (Japanese). AkihabaraNews has several hi-res photos of these Gigabeat players.