It wouldn't surprise anyone if it got a sequel. In fact, it would make lots of gamers happy.
It seems publisher Warner Bros. is looking for feedback concerning your experience with Middle-earth: Shadow of Mordor . This implies a sequel, no?
Short Pause notes a survey that was sent to former and current players of the award-winning game. They do ask questions pertaining to other franchises but for the most part, it's Middle-earth -oriented. There's also a bunch of questions concerning DLC practices, which is bound to get a response from avid gamers.
What would you like to see in a Shadow of Mordor follow-up?
Related Game(s): Middle-earth: Shadow of Mordor