Middle-Earth: Shadow of Mordor 2 seems like it's a thing that's happening as the title was leaked via a stuntwoman's curriculum vitae.
As discovered by NerdLeaks, the actress listed her role as "stunt/acting" for the yet-to-be-announced title and noted Blur as the employer. Blur Studio is a CGI team that's worked on several video games and films and the stuntwoman worked with the company before on such titles as Batman: Arkham Knight, Dark Souls 2, Assassin's Creed: Unity, BioShock Infinite, and the Mafia 3 trailer.
It sounds as if her work on many of these projects was related to motion-capture for CGI trailers, suggesting that Shadow of Mordor 2 will receive such a trailer, perhaps at E3 this year.
Allegedly this sequel could star Lithariel, a playable female character that was added to the first Shadow of Mordor as free DLC.