Along with a bunch of the XY Megas, Nintendo trademarked some other Hoenn Pokemon.

So, we should be getting Megas of :

>Groudon
>Kyogre
>Rayquaza
>Plusle
>Minun
>Keckleon
>Sceptile

There's also ones for Jynx, but Im not sure where that'd work in for RSE. Was there any where for Jynx to be?