Calling now, Zoe will be the new Azir Release
The first week after release, 37~40% winrate plus several posts on the front page asking for buffs. The second week Riot buffs Zoe, and she gets to 50%.
One month later players figure out how to play her and nuke the sht out of everyone with her Q and then everyone calls her OP until riot gut her to oblivion.
All that can be avoided by not listening to the board for her first week or so, banning new champions from ranked for 2 weeks and wait for at least a month collecting data before even consider buffing or nerfing newly released champions.