Re: AVENGERS: Grade, Reviews, Discuss, DVD & Sequel **SPOILERS**
The Thanos reveal at the end of Avengers may lead into Guardians of the Galaxy.
I can see an appearance Thor or Loki or even Sif and the Warriors Three in a GotG movie. Especially if they pick up on Thanos' in terest in the Tesseract. I'm sure Hemsworth signed a multi-multi-film deal ala Samuel L. Jackson, so it wouldn't be out of the question.
I hate having thoughts on the top of my head. They usually jump off and commit suicide.