This looks to be all of the Precure teams between years 11 - 20 of the franchise.  Happinesscharge was at the 10th anniversary, so it'll be Go Princess to Hirogaru Sky.

I wonder if the others Cure teams will react to Cure Wing gender.

The movie trailer
It appears the previous lead Cures will at least have a cameo, judging they briefly appeared with their backs shown near the end of the trailer. I guess this is better than All Stars Memories where they only focused on 2 teams of the Precures

And yes, of course they are putting Nodoka (+ Rabirin) and Mashiro into the same scene

Added the artist based on this tweet, someone please check since I don't speak Japanese: https://twitter.com/kamikitafutago/status/1677931732950204416

Ola said:

Added the artist based on this tweet, someone please check since I don't speak Japanese: https://twitter.com/kamikitafutago/status/1677931732950204416

According to https://twitter.com/kamikitafutago/status/1677981391638917121 fed into Google Translate:

After checking, it turned out that the poster was also drawn by Mr. Nishiki Itaoka, chief animation director and character designer! I was surprised at how freely the creators' painting touches changed! ! I caused a fuss by making an arbitrary guess

And also written in small print at the bottom of the poster it seems.

BrokenEagle98 said:

This looks to be all of the Precure teams between years 11 - 20 of the franchise.  Happinesscharge was at the 10th anniversary, so it'll be Go Princess to Hirogaru Sky.

Seems like not all of the cures from each of the teams will be featured.  Pretty much the only cures that will make an appearance, or at least have any part, are those pictured in the poster above.  Moreover, each of the characters will be teamed with one of the members of Hirogaru Sky, with the name of the team being the name of that cure, e.g. Team Sky.