Marvel is working on a film adaptation of The Inhumans, based on a script by Joe Robert Cole, Collider is reporting.  The report appears corroborated by a hint actor Vin Diesel dropped on his Facebook page over the weekend.
Diesel loves to tease fans on his page, and after announcing meetings with Marvel Studios last year before San Diego Comic-Con and playing coy with the press, he was announced as the voice of tree-creature Groot (see "'I Am Groot!' Says Diesel").  Over the weekend, he posted a picture of Groot, with the cryptic caption "Vin and Marvel... you all made it happen! I get the strange feeling that Marvel thinks I'm Inhuman... Haha."
During the 2013 SDCC press tour for Riddick, he hinted that there was another role down the road for a new IP that he was really being courted by Marvel for.  He told Entertainment Weekly that "Marvel was excited about bring a different kind of relationship, a different kind of love story, I guess kind of inspired from the Dom-Letty relationship (from Fast & Furious), into the Marvel universe."  The internet immediately jumped to the conclusion that he was referring to Blackbolt and his love interest, Medusa.  With the announcement of the Inhumans script being shopped with directors, that rumor may actually turn out to be true.