Game Freak has a way of always having something to look forward to in Japan. Right now, it's the 12th movie (for japan, anyway) and the release of arceus, and if G/S gets remade it'll likely be announced on a trailer at the end of the movie, if not sooner.
They also have a knack for releasing games in the fourth quarter (September-December) in Japan, so the timing matches up if they were to remake it.
But saying that there are no hints is just absurd; there's plenty of hints, down to the really small ones. Just the johto starters and pichu being in movie 12 ought to be enough, but the various npc remarks about Professor Elm and Jasmine being in sunnyshore combined with the data being in d/p should be plenty of reason to suspect a remake, unless nintendo just likes screwing with us.