On Katarina Nerfs on PBE
The reason for the nerfs to her ultimate were given as she is roaming bottom lane alot and is very good at that and the next season you predict mid will roam bot even more so you wished to cut her power in the early game. I don't feel that you considered that Katarina mid-late game and late game is completely team dependent and without that early lead and impact is entirely bottom tier again.
She does need some sort of compensation to her late and mid late game if you are going to cut her early game because she can't 1v1 mid very easily already, she really only does good in early and sometimes mid game skirmishes. If she gets ahead there her impact can be felt longer into the game. But if everyone gets durability and/or groups and the better engager/initiator is on their team, all things pretty even or kat ahead... she is almost entirely useless. I don't know how much the ult changes will impact her ganks bottom. But I know how it will make her fair mid. A lot worse. The thing about ganks bottom lane whether you are talon, zed, kat, or any other mid who can roam is you're going to win. Because you will outnumber the people you're fighting against you will win in all but extreme circumstances.
Being able to ult every minute allowed you to keep pressure up mid so you aren't just forced out of farm. Which can easily happen to kat. So I urge you to rethink your strategy in balancing kat as she has had a very tumultous past at your hands and us kat players are quite frankly sick of the roller coaster.