We got some more new Zane info at the gameplay reveal today:
Obviously gonna have to play the game to know for sure, but this seems like an inherently bad idea on paper. Getting to use two abilities instead of one could easily make him OP compared to the other characters. Just having a quick look at his skill trees, there's a ton of synergy there, and I very much doubt his individual abilities on their own are very much weaker than those given to the other characters. Why would I wanna use a character that limits me to one ability, when I can use a guy who gets two?