Will Riot be adding more Champions to the game?

I hope so.

Currently, they didn't even put a single Piltovian champion in the game mode.

yes they said theyll be adding champs, really hope to see xin zhao.

aside from that, im sure theyll add more popular champs, im sure thats why yasuo is in it. like riven, ryze, caitlyn, teemo

I don't know if is in, but he could be a 5* champion like Kayle and Yasuo. He'd be a shapeshifter, wild, and brawler.