I'm not a Rioter, but personally I think Yasuo only got the barest of a buff from preseason. Yes, the original Warlord's Bloodlust was completely broken on him, but now with it being relatively useless on any champion that isn't an crit-ADC (even then the use is limited) I think he's basically in his same old spot of the vast majority hating his guts. Personally I never understood the hate. Yes, I am a would-be Yasuo main, but he's not that hard to stop as long as you do so early. Overall, preseason didn't really do much for or against him in my mind. I do have a board topic that explains most of my thoughts on the Warlord's Bloodlust keystone here for anyone who wants to look.
I... kinda lost my train of thought getting that link so I'll leave my comment as is, though I know there's something else I was meaning to say, I just can't remember it...