It is not like they'll have anything to tell about WoW before February so might aswell keep everything for Blizzcon.I've been concentrating on the reality that 9.1.5 is in Late October and the appeal to the public event will be around Mid-November where they outline their plans going ahead while probably showing off a CGI Cinematic, although there's some inkling that BFA's "CGI Cinematic during the Games' Cycle" were actually a "Last Hurrah" by the Cinematics Team as their budget may have been cut and only be used for Expansion Reveal Cinematics. So it is hard to tell. I would very much hope that's not the case as more CGI Cinematics would be very much preferential at this point.
I think in Blizzards' best interest it would be to do something big info wise in November, I do not believe in the info drought lasting until February's Blizzcon Event. It would affect their consumers and numbers far too much. However I feel we're in No Man's Land right now as there's no Ion interview by PCGamer to tell us to be ready for the next patch info cycle. We know 9.1.5 is most likely set for Mid/Late October and Classic Fresh news will be given soon. But, again I just do not see PR people at Blizzard leaving Q3 and Q4 without any hype for their properties as Overwatch is previewing Overwatch 2 at the Overwatch League Playoffs and Finals this week. It would be odd if they just leave WoW players without information for the remaining months of the year.