Now, the actual source in which said information was reported can be found in this link:

https://news.hisstank.com/2020/10/06/tfw2005-coverage-of-hasbro-brand-panel-at-festival-of-licensing-71091

which says:


My Little Pony

> So many announcements for the upcoming CGI movie and the upcoming series. It was hard to keep up. The series titled as Pony Life already has Season 2 greenlighted by Hasbro.


PONY LIFE

> Pony Life will feature the same voice actors from Friendship Is Magic.
> Looks at the funny side of friendship. More humor, and relatable stories for a brand new generation.
> Pony Life will debut this month.

CGI MOVIE

> New generation of ponies to new generation of fans.
> Brand new cast.
> Old cast (Mane 6?) will be featured but the majority of the focus will be on the new characters.
> A new ensemble of cast means exciting new products.
> Toys are innovative and stays true to the DNA of the characters.
> Working with a powerhouse like Paramount was incredible.
> eOne editorial team is also working on the movie.
> Movie releasing September 24th, 2021.

Leaving this right here, so you can speculate a little bit but it seems that we have less than a year of this post gen 4 transition. However, just because the movie premieres on September 2021, it seems that the actual series won´t start until 2022 arrives. The mane 6 is left with a question mark when it comes to the movie, by the way.