In an interview with Screen Crush, Kevin Feige was asked if Marvel Studios had any intentions of using a human Nova, specifically Richard Rider, in Guardians of the Galaxy. Feige's reply, while crushing my hopes and dreams, does leave the door open to the eventual inclusion of one of my favorite Marvel characters.
All kidding aside, at no point did I really expect to see Richard Rider in the body of the Guardians of the Galaxy film. I have been, and remain hopeful, that we might see Richard Rider in the post-credit's scene that Marvel is holding back for the premiere, but I'm not holding my breath. The fact that Feige confirms that it was Richard Rider and NOT Sam Alexander is the big nugget from this piece. It may not be now, but I'm happy to hear that Richard Rider's inclusion in the MCU is still a possibility!
Screen Crush: "Was there any thought to introducing Richard Rider in ‘Guardians of the Galaxy,’ or was that just too much?"
Feige: "There were some thoughts to it, yes, back in early drafts in the early development stage. But, there was a fork in the road that we came to at one point in the development process where we decided to eliminate Nova and go full-on with Peter Quill’s story."