devtrackers.gg
We're not doing compensation changes to champs who might be affected until it's clear what sort of changes are or aren't necessary. Expectation is there'll likely be at least one champ who needs a bit of work, given the number of current Rageblade users.
I sincerely hope this is specifically referring to Kog'Maw. He's sitting on a 2% P+B rate and relies heavily on Rage Blade + BotRK, both of which will have been recently nerfed as of 9.10.
He's one we'll look at yeah. Can't guarantee any changes, but putting time aside to assess.