When does half life 2 episode three come out

2011
Remember that Valve runs on the modified 'Valve time' meaning that they rarely keep to release schedules and take a long time to produce games. Valve initially said it would be released in 2008/2009 but that never happened. Now, according to computerandvideogames.com, HL2 Episode 3 will not be released this year (2010).

In the links section is HL2 Ep3 news that may interest you along with links to art of the game. but rumour has it that half-life 3 is coming instead of half life 2 episode 3,