MapleNectar confirms that TF is the next champion, coming Patch 9.14

Based on this earlier teaser we can deduce he will be Pirate, since he shares that Splash with Graves. It makes sense to add another pirate, since they turn on very late (with GP). I think he'll be a cheap unit (maybe even 1$).

Now for his class, this will be more interesting. Another sorcerer? What else could he be?