>>27283267My hopes are that mega stones get replaced by the new special move system, with the new bracelets and the Jojo poses.
My expectations are that a handful of new mega evolutions will make it into the game, mostly for starters, the last pseudo-legendary to need one, and every new legendary gets a new form.
Overall mega evolution was a mistake. As a concept it was a good idea. But rather than using it to boost Pokemon designed to fall off late into the story (like bugs and most Gen II Pokemon) GF gave them to a ton of starters and pseudo-legendaries and pushed Pokemon back into competitive status or outright broke them.