I think that Pokemon's going to release the Mega sets in 2026. It wouldn't make too much sense for them not too. Although, while they did imply the main focus of the H block would be Paradox Pokemon, the focus ended up shifting towards Stellar Tera Pokemon in the second half. But at the same time, I don't feel like it would make much sense for them to tease a big focus on Trainer's Pokemon in the I block and then have the final two sets make them take a backseat for Mega Evolutions.
Also, my biggest hope for the return of Megas is that they have them play more in the style of Pokemon Level X and Pokemon BREAK than how they did in the XY era. God, can you imagine a Mega Charizard ex with how the game currently is?