Jon Favreau should be happy. His worry about reaching a 2010 deadline just a little easier.

Variety is reporting that actor/screenwriter Justin Theroux has signed or is close to signing on as the scribe for Iron Man 2.  Theroux reunites with Robert Downey, Jr., who co-stars in Tropic Thunder, which Theroux also wrote.

Theroux also acted in Charlie’s Angels: Full Throttle and HBO’s Six Feet Under.