Now, I never played the 3rd Generation of games, but a good deal of the Johto pokemon were in the B/R remakes, yes? Assumedly to make these pokemon available for the 4th generation. Now there's not much use for a G/S remake to Nintendo, with all the pokemon available and the collectors/battlers happy, they'd probably rather make a new game. (They do seem to make a point to make battlers/collectors happy, due to the completely random presence of the legendary birds in 4th gen).
Nintendo has some unused registered names that could possibly be used for remakes though, and I wouldn't mind seeing remakes since Platinum is the first game I've played since Crystal, but I think I'd rather see a fresh storyline, but the new pokemon that always comes with it is something I might not want to see. (Since the collection is getting bloated.)
I think that these hints people are seeing in the anime/manga are reaching and hoping, but they're just harmless comments.