They mean “chapters”? The buildup for Opaline’s defeat better be worth it.
Likely. We have the special No. 1 as Chapter 1 and the first eight episodes as Chapter 2, since the special No. 2 in November, which will be Chapter 3 (which may introduce us to the bus “Marestream”) - and we know that are two other “chapters” in what will become Season 1, which will end in spring 2023.
It is possible that Season 2 will start in the autumn, and it is possible that we will have at least four “chapters” in 2023-2024.
It is known elsewhere that Hasbro will continue until the end of Season 3, but considering that there is so much going into production for both TYT and MYM, it is obvious that there will be a lot more in a shorter amount of time than when G4 was in the air.
I think G5’s future will be decided after S3 which could take place in 2024-25 and it is possible that it could be extended by at least two-three more seasons until 2028 at the most. I think the year 2028 may be the last year for the G5, the work on the G6 for the next decade will start in time towards the year 2030.
And I definitely don’t think that Opaline is the “end boss” of G5. The movie suggests that the Big Bad of MLP himself will become the end boss of G5 when Sunny and her friends complete their mission to raise Equestria and the rest of the world to a new era of glory.