Last season, The Clone Wars introduced Maul’s brother Savage Opress. This year, the series will feature Maul’s resurrection. Entertainment Weekly broke the news with a teaser video and interview with Dave Filoni; however it’s unknown exactly how they’ll be bringing him back and if they’ll use the popular cybernetic design.
A few years ago, they published a Star Wars comic titled Visionaries. In it there was a story where Darth Maul arrived on Tatooine complete with cybernetic legs and Obi-Wan fought him once again. The design naturally became a fan favorite, and Sideshow Toys recently made a pretty awesome statue of this version of Maul.
The very short clip Entertainment Weekly posted did show Maul with long horns like in Visionaries; so it’s possible they will be using that version in the show. We’ll find out in the spring.