There's a very brief press release
on the Nintendo website which purports to announce the Nintendo 3DS (which sounds like a working title):
Nintendo Co., Ltd. (...) will launch "Nintendo 3DS"(temp) during the fiscal year ending March 2011, on which games can be enjoyed with 3d effects without the need for any special glasses.
More details will be announced at E3, but it's clear that this will be the next in Nintendo's world-dominating series of portable gaming consoles.
Hopefully we'll have some more information soon; the promise of magical 3D is certainly intriguing.