We know that Namor is owned by Universal and not Marvel Studios as Kevin Feige stated as much.
We know that Legendary Entertainment recently partnered with Universal after parting ways with Warner Bros.
We know that Legendary CEO Thomas Tull likes his comic book movies (Man of Steel, The Dark Knight Trilogy, Superman Returns, Watchmen).
And we know that recently Universal and Legendary announced a mystery tentpole movie for November 4th, 2016.
As we stated back last August, maybe a Namor movie would work now that Universal and Legendary are a pair.
Well, that is the rumor: that the November 4, 2016 release could be for a Namor movie.
It's also possible the earlier rumor about Zac Efron for a Marvel movie could be for Namor.
Maybe we'll find out at Comic-Con this Summer.