A few months ago Stan Lee was asked if he would have a cameo in Guardians of the Galaxy and it didn't look like it was going to happen. This is what he said:
"No, I’m afraid not. This is the one group I didn’t create. I didn’t write Guardians of the Galaxy. I’m not even sure who they all are!"
It looks like things have changed though for the comic book legend. Even though he had nothing to do with the creation of these characters, he will still have a cameo in the movie. Stan revealed the news himself when a fan asked him about it at Chicago expo c2e2.
“I did, already. I can’t tell you what it is, but I can tell you I do not understand what it was or why I did it. It has me with a girl — a very pretty girl — that’s all I can tell you."
So the streak of Stan's Marvel movie cameos will continue! Stan's the man, and even though he didn't create or write Guardians, it will still be fun to see him in the movie. After all, Stan is a part of the Marvel Cinematic Universe.