User blog comment:Elecissa/Future Katarina changes and all Katarina post/@comment-10958553-20150126212806

The auto attack changes and attack speed changes seem to be aimed at accomplishing two things;

First they want to make spell blade items more useful on her with the her auto attacks hitting faster. This is actually a pretty big change when you think about how fast she will dig her daggers into you.

Second; her new changed Sinister Steel scaling might make ad/hybrid builds more popular. While they likely won't mind her benefiting from a few auto attacks, they likely don't want her to duel any fighters. This keeps AD katarina a caster/assassin and discourages any fighter/duelist builds.

Basically you woulnd't ever want to build attack speed on her.