Reggie Fils-Aime confirmed to Jimmy Fallon on his Late Show last night that 3DS would be released in the US during 2011.
So, that's that, then.
Reggie dropped the year without giving a particular month or region.
Nintendo has said many times that 3DS would be out before March 2011 with one region possibly getting it in 2010. Guess it's not the US,then.
Watch Reggie on Fallon for yourself below - the date hits around the 1:57 mark.