Things that definitely will need nerfs before preseason is over
Things that already have nerfs on PBE
Syndra Vayne Courage of the Colossus Rylai's Crystal Scepter Ivern Twitch Rengar Leblanc
Things that will still need nerfs
Lee Sin Redemption Exhaust Ghost (on ranged champs specifically)
Things that might still need nerfs
Ghost (on melee champs as well) Vayne Twitch Zac Hecarim Ivern Kennen
Please feel free to add more