According to the leaks (which are now pretty much confirmed (99%)) we won't get New Mega Evolutions but that doesn't mean Mega Evolutions will be removed. It also Mentions Ash-Greninja saying something like this, "Ash Greninja, No New Mega's, Make your own connections there, also the original Chinese leak mentions transforming so Synchro will happen. Also the starters will have Day/Night Evolutions