A few hours ago League of Legends Facebook account shared an excellent piece of video clip named Mind of the Virtuoso. It showed a new champion in mask soon coming into battle. The details of him are not released yet, while the info in the video can provide us more confusion than intel. What I can guess is that it is a male ranged champion with gun as his weapon and his background story implies that he might have the power of mastering burns.
Remember how Overwatch introduced Mei to players? Yes, the story in the form of diary. The video works in the same way, which provides room for imagination. I should say it always reminds me of the mask in V for Vendetta (especially the smile ---Agree??!!).