twitch is being updated.
his w was reworked to a lingering poison cloud that builds up stacks of his passive per second on enemies, and slows. his stealth mechanic changed, and i think his ult too. it even gets its original name back. "spray and pray"
nocturne is probably being reclassified as a dive fighter, and adressed when riot gets around to a diver fighter update. theyre still debating if vanguards or dive fighters are next for a class update.
yi is considerd a skirmisher i think, but his kit doesnt really fit the assassin description. imo hes closer to a dive fighter than an assassin, even on a squishy crit build.
hes the archetypical melee adc, and entirely a thing of his own. plus, his kit doest have the issues that theyre currently adressing with the assassins. he doesnt burst enemies too fast with too little counterplay, and he isnt a stealth champion.
kassadins kit is still broken, but either riot is planning on giving him a larger rework that goes beyond the scope of the class update, or they just still have no fucking clue how to fix him without changing his identity and completely removing his iconic ult.