I think his W will actually be unchanged. It's totally balanced as an ability.
Also, I don't think his double crit chance is OP. People just have no idea what they're talking about. Yasuo rushing crit early means that yes, he's critting on every hit, but he's critting you for 80 damage while a Riven would be doing 100 per hit despite not critting.
But apparently just seeing the red number tilts them instantly, without even seeing for how much.
Generally, I would not mind his double crit chance getting removed if they add another powerful affinity with crit into his kit. I'd rather have to build 100% crit myself, and have a crit damage bonus in my kit, than only have to get 50% but do shitty crits anyway.
At the end of the day he's a late game champion, so his early reliance on non-scaling things (passive, E) really puts me off.
I really hope they do him justice without getting affected by the noobs that cry "omg d1leet him" or the idiotic 'yasuo mains' that say that he's IDEAL as he is right now.