Nikkei, a Japanese business news source is reporting that Toyota will be unveiling a Prius that will have built-in solar panels. It is also said to be manufactured by Kyocera Corp. There is no official word on this, since Toyota has not actually confirmed the reports just yet.
If it were created, Toyota would be the first major manufacturer to add a car with built-in solar panels and release it to the mass market. The third generation Prius isn't due to be released until 2009 or the 2010 model year.
The picture shown here is quite obviously an artists rendering, since this is very much still a rumor. Hopefully soon Toyota will give us some juicy details and confirm these rumors.