I'm not sure, too early to say and I'll have to try her on PBE. my early guess is no as she goes lifesteal build primarily. the runaans is only core on her because of the passive applying the rend stacks bork to multiple targets. lifesteal is so important to kalista as she needs to sustain to get those rend stacks up. going full IE type crit on her is also less efficient than it is on another ADC so why go crit on her when you could pick another adc who does it better? you pick Kalista for her unique playstyle and rend stacks on multiple enemies. LIfesteal for maximum amount of kiting, and runaans just for rend stacks. the crit on runaans will certainly help her in general though. 30% crit is nothing to sneeze at and this will help her autos do a little more up front damage even if it is drastically reducing her attack speed.
Crit Kalista has always been viable and in a 1 v 1 duel it is deadly as for single target with kiting she will melt a tank pretty fast. but it is not as efficient as the runaans lifesteal kalista for her ability to pop rend on multiple targets in a team fight is huge.
case and point: look at sneaky 1 v 5 at the end of CLG vs C9 in their last summer split game vs each other this year. Sneaky damn near got a solo penta cuz of lifesteal, kiting, and killing pobelter AND doublelift at the same time when he popped his rend.
TLDR= crit kalista always been an option, but lifesteal runaans kalista is always going to be ideal.
