I have an idea for the new guy, and what his ult could be.

Because in his teaser, near the end, and before you can see his face, it shows him shooting someone and a tree grows from them, kinda rooting them in place. I thought that in game, if he is the new adc, then his ult could be like Caitlyn's ult and Lissandra's ult, which he aims at his target and shoots, and when the bullet hits, then a tree grows, and root's them in place. It's just a thought.