[TF RyuShin]

IIRC, I will try to list the date of the press conference with the usual Summer Movie because that's usually where we got glimpse of our new Rider:

Revice : PC on July 27, 2021 but Superhero Senki already aired earlier on July 22, 2021
Saber : PC on July 29, 2020 but no Summer Movie for Zero One this time. The date actually a bit close with Revice.
Zero One : PC on July 17, 2019 and Over Quartzer aired on July 26, 2020. This is the latest instance where we got PC first before the new Rider debut in Summer Movie
Zi-O : PC on Aug 7, 2018 and Be The One aired on Aug 4, 2018. The PC was a bit latter from the Summer Movie.
Build : PC on Aug 1, 2017 and True Ending aired on Aug 7, 2017. This time the PC was earlier than the Summer Movie.

Considering this, I think we can roughly estimate if we don't get any info on Geats this week, it's most likely by next week they will announce the PC. It's most likely they won't reveal any info closer to Battle Familia because it might kill the movie's hype.