Is Red John really coming back to The Mentalist?

According to leaked information regarding the show's 21st episode - titled "Red John's Footsteps" - an array of bloody smiley faces begin appearing around town, following the kidnapping of twin sisters.

Might this truly be Patrick Jane's nemesis? Or could it be another copycat? We'll have to tune in and find out.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.