What I see, looking at the new Mega Evolution mechanic, is 10/30 mega evolutions stemming off Pokemon from Hoenn, 3 of which are not available in the main game (Blaziken, Latios, and Latias). In addition to this, all of the Hoenn Megas make no appearances during the story of the game, with the exception of Gardevoir, and the 7 available are all post game. To me this seems like strong evidence for Hoenn remakes, as it would mean that in those they could make the Megas available for use in the story of those games.