NIKKEI NET（日経ネット）：主要ニュース−各分野の重要ニュースを掲載
Yes, rumors were abound before but it appears to be more solidified this time as it is from a respected Japanese source. Here's the list of
known features:
-Built-in camera (it sounds random, but the Gameboy camera was just as random too)
-Music playback (rumor: has SD card slots)
-Improved wireless capabilities (rumor: for use at information terminals or even browsing the web)
It's hitting the game sites lately. I can see the wireless and the camera but not the pirate-magnet that is the card slot.
People are also putting this in tune with this week's Nintendo conferences. There's one on the 2nd but I heard there was another one too.