Hello, actually I can’t answer you.
These are just my thoughts. Blade Runner 2049 is a big movie and I’d dare to say it will be premiered both in La and NY few days before the official release in the Us (Oct 6).
They could also come in Europe. Maybe in London and Paris (?) soon after the Us premieres. They did like this for La La Land in the end.
I will post as soon as I know for sure.