Lucha Underground is set to return with it's third season on The El Rey Network on Wednesday 9/7 at 8 PM ET. The promotional material is stating  

"The luchadores return to the Temple and a spin of the wheel can determine their fate; Rey Mysterio in action."

To give it some build up for the season 3 return, El Rey will be showing the three parter  "Ultimate Lucha" finale from the second season on 9/7 starting at 4 PM ET.   The El Rey Network is now available for anybody who is a Verizon Fios customer as well as Time Warner Cable, among several other cable and satellite providers out there.

Also, there are plans to film a fourth season this fall sometime.