Board Thread:Questions and Answers/@comment-68.38.63.82-20140802181548/@comment-1509585-20140923024154

What about this?

Only the editing process and post-production begins two weeks after "Avengers: Age of Ultron" filming ends and Whedon then talks about how James Gunn's "Guardians of the Galaxy" impacts the Avengers. It seems the " Avengers 2" director feels that at this point he's separate from the Guardians as their world is of a different galaxy than that of the Avengers. Though  Kevin Feige will only bring to the director's attention what may or may not affect his films and would even sometimes be told how Whedon would affect Feige's plans. Of course, with the Marvel Universe eventually somethings has got to give by having worlds collide.

http://www.examiner.com/article/joss-whedon-talks-about-the-dc-cinematic-universe-and-guardians-of-the-galaxy