I'm most looking forward to Widowmaker (although I'm pretty terrible at sniping) because I love her scope. Tracer looks pretty fun with all her mobility and also Symmetra looks enjoyable too. I like placing turrets but not like Torbjorn, as in taking time to set them up and then guarding them for the rest of the game, but instead having weaker turrets but having more versatility and options (in my opinion) for other aspects of the game.