The League of Legends website has a new champion reveal for Illaoi, the Kraken Priestess. They don't say when she will be added to Riot's MOBA, but they offer screenshots and details on her kit and playstyle. Here's an overview:

Most champions arm themselves with swords or guns or magic or whatever, but Illaoi’s bringing a freakin’ god to the Rift. One of the new breed of juggernauts, she’s a slow but impactful solo laner in any game, with tentacles that offer huge zone control once they worm their way into a game. And while she lacks traditional gap closers to start fights, she can pull the spirits from distant squishies and destroy them, rendering yet another vessel for Illaoi’s god, Nagakabouros.