Valve has confirmed that Portal 2 will be released on 9 February 2011.
Valve originally revealed that Portal 2 would be delayed until 2011 during E3 - through an 'Aperture Science' e-mail - but didn't give a specific date of release.
The studio told us today at Gamescom that The Office actor and co-writer Stephen Merchant will voice 'buddy sphere' Wheatley in Portal 2.
Valve boss Gabe Newell announced Portal 2 for the PS3 at E3 this year and said it would be "the best version on any console".
However the Half-Life developer ruled out 3D for Portal 2 on PS3 but teased 3D support for Portal 3.