Wukong the monkey king has been Riots pet champion that they've built up quite a lot of hype around. While I was uninterested at him at first, the gameplay Riot finally showed of him surprised me greatly and he looks like one of coolest champions to play in the game, especially his ult.
Also to note as possible interest for Dragon Ball (not Dragon Ball Z) fans is the potential reference to Goku through the design of the champion. Firstly, Wukong has a staff that extends in length. Power pole much? Also, Wukong is well, a monkey and Goku as well known for turning into an ape. It's just speculation but It'd be pretty interesting if that's who they based the champion off.