"Rumble and vlad will be op with the itemization changes"
's poison now slows for 40% and lyandry buffed as well along with 
's poison now slows for 40% and lyandry buffed as well along with 
Dots only slow for 20% I'm not really experienced with those champions so I'm not sure how big the impact will be.
He wont be OP doe he will still be kited by the meta picks atm -Vayne kalista gnar - Remember you have to be in front of the enemy to poison, Rumble ult and q = kited
Wouldn't be surprised if singed winrate would go up to 60% (on singed mains) this patch. It was already 56% or so, and he got straight up buffs and itemisation buffs.