So far there's just a picture of what was shown at GDC, but more information to be revealed at E3. At best, I'd guess this would either be released in Holiday 2011 or Spring 2012. Most likely the latter, knowing how Nintendo is.
As what was said before:
"Last and not least, Nintendo president...
Like Columbus and America, I have found the Nintendo DS rather late.
I've been stealing it from my girlfriend since late last year, and it makes up for the fact that I have an obsolete PC, a broken PS2 and a brother who moved out with the XBox I paid half for.