Back in November of 2012, Stan Lee said Doctor Strange, Black Panther and the Inhumans were either being worked on or are in development.
Now, coming out of Wizard World NYC (via MTV), Stan "The Man" says more of the same, confirming Doctor Strange and Black Panther, but also stating Silver Surfer.
Well, let me put it to you this way: Back at Marvel, they are frantically looking for what is the next one they’re going to do. There is no way they won’t eventually do a Silver Surfer movie. It may not be for a few years because they’re thinking and working on Doctor Strange, Black Panther, Ant-Man, Guardians of the Galaxy. Everything we have. And the fans seem to want all of them. But they’ll get around to a Silver Surfer feature because he’s a wonderful character.
Currently, Fox Studios owns the rights to Silver Surfer, but interestingly enough it was rumored that Disney tried to nab the rights to the character as well as Galactus in exchange for Daredevil.
It's since been made known that Daredevil has reverted back to Disney/Marvel Studios, with Fox stating they are not letting go of the Silver Surfer.
Many fans think that the Silver Surfer will appear in the new Fantastic Four reboot being directed by Josh Trank.
Perhaps a Silver Surfer spinoff will come from that?