One alternative is that we see the Halloween maze being announced towards August, sort of to remind people that there's a movie coming out in October. IIRC, Dracula Untold back in 2014 was announced pretty close to the event in order to tie-in with the movie's release. Ditto with last year's mazes, with HoB, Insidious and Jigsaw all announced around August in order to raise awareness for the movie.
In terms of what announcements we'll see soon, this popped up on Twitter:
...so, UCM coming soon?