Rito is giving Renekton the good ole more damage fixes everything routine.
So on the PBE right now they have this for his Q: Damage increased from 65/95/125/155/185 to 75/105/135/165/195 Enhanced damage increased from 95/140/185/230/275 to 110/155/200/245/290
Personally, I don't quite understand this buffs, seeing that his damage is pretty damn high. I know he's not great right now, simply because I don't see him much, but I can say with quite a bit amount of confidence, that damage was not his problem.
Honestly, all these damage buffs are making me believe Riot doesn't even care about the state of the game, they rather just push stuff out and get paid...