I really don't understand it.
At the moment, we know that SV9 will be available at the end of the month, SV10 at the end of May and SV10.5 in July. Even if this hasn't been officially confirmed, we've had leaked information from the French distributor indicating that there will indeed be an SV11 and an SV12 (September and November). I don't rule out the possibility that they didn't have the info and simply anticipated the usual logic. But I'd be surprised.
I'm not ruling out the possibility that the Megas will return in these end-of-year sets under the SV banner, but that's contradictory with the fact that they're teasing the arrival of a new block for this same year. Is it conceivable that this year's last two expansions will be included in the SV block, but with a “Mega” subtitle of some kind?
What's certain is that some Japanese cards from the SV era have not yet been included in our sets (I'm thinking, for example, of Professor Birch's, Juniper's, Kuikui's or Magnolia's trainer cards). We know that Sada will be included in SV9, so we'll probably have the others in SV10 and SV10.5, but if this isn't the case, it would mean a mix of SV and Mega for the last sets of the year.
In any case, I'm confused by this strategic choice. It's possible that trainers' Pokémon will also be included with the Mega sets, but I'd really have considered focusing the 2025 mechanics solely on trainers and incorporating the Mega sets only at the beginning of 2026.
Anyway, I'm really waiting for the official news.