As we all know Voracity eats up a large amount of Katarina's power budget and due to the sheer sporadic power of it the rest of Katarina's kit has to be err.. minimal in terms of power.
Question is what direction should Riot go in the assassin update? keep the insta resets or find another way to improve upon her kit? Or scrap the passive Entirely and give her basic abilities more OOMPH and if so what Ideas do you have?
discussion and theorycrafting below
ModWulf Helhammer2 votesResets and teamfight cleanups are pretty core to what Katarina is. Riot has said that they like the teamfighting aspect of her, as she's really the only assassin made for that (as in she can actually damage a whole team even when she's not super fed). Most other assassins are made to take out solitary targets, and usually damage teams as a side effect of them being fed
Warmanreaper1 votesWhat they need to do? Give her a new everything.. Make her actually take skill instead of the player smashing his head into the keyboard so much that it's full of blood and then they get a free penta.
Critmaster Garen1 votesim not sure katarina should get major changes.
shes one of the better designed assassins. a change of power distribution within her kit could probably work, but functionally all of her abilities should pretty much stay the same.
maybe with the exception to her ult splitting the damage between 3 targets. so she gets rewarded more for going for isolated targets over hitting as many people as possible, as it would make more sense for an assassin.
La Bello1 votesId debate that this isnt the case. Katarina has only ever had 4 constants since her debut
DeathLotus, voracity, Shunpo and Bouncing daggers. W time and time again has been shown to be interchangable fluff.
I think Katarina's passive is what ultimately is inhibiting her potential. On most champions its only ONE skill thats reset on a kill but on Katarina its damn near everything. If they could remove this passive and make reseting unique to Bouncing Dagger and shunpo youve already created more room for a interesting kit .Apply mark/consume mark for damage is hardly a interaction and Riot is clearly capable of keeping all the skills and just have them become more interesting when used in conjunction (for example the new 
kit Riot kept his core abilities but added alot more options and vesatility to him overall) .
Things that Id say are Open season for Riot -W (Sinister Steel) -Voracity (Passive) -DeathLotus (in terms of functionality and maybe giving it a secondary goal past "deal a bunch of damage")
Calabok1 votesNerf her ultimate damage and I will be a happy zombie
Quepha1 votesReduce the power and/or reliability of her regular abilities and give her a second way to score the reset.
Infinite Saught1 votesYou could go so many different ways with Katarina while maintaining resets and teamfight potential. You could change the function of two abilities, switch around her abilities, add/subtract power, do nothing, etc. The most possible options (based on Rito's view of assassins for the update) are: Spread her damage out. Nerf Voracity's instant reset. Change Q W so that it's not instant and instead over time/delayed somehow (which is the most likely assuming from what they said).
The only thing that bugs me is that they aren't changing her ultimate.