For anyone wondering when 9.2 will be, major content patches need around 3 months of PTR testing before being released to the live servers.
For example, 8.3 was deployed on the PTR on October 7, 2019 and released to the live servers on January 14, 2020.
So let's say Blizzard announces it late November, a few weeks after 9.1.5, that means late February or early March. Ideally, it should come out just before Blizzcononline so they can say "major content patch 9.2 just hit live servers a week ago blabla" and focus all their time on talking about 10.0 during the presentation.