That's two separate things pointing to DPP remakes, first Diamond Head and Peal Harbor and now the Munchlax distribution. While I'd absolutely love remakes I'm remaining skeptical as it could just be a coincidence. I think seeing a lack of gen 4 Pokemon available in Alola will point towards gen 4 remakes but only time will tell.
(Still secretly hoping for an Alolan Torterra with sand and a palm tree)
You know, when I think they picked Hawaii to be the Gen VII's region I don't think they were thinking "say, Hawaii just so happens to have places called Diamond Head and Pearl Harbor, it would make a great foreshadow to DP remakes!". Also considering one of the locations is Pearl Harbor, well, if they were to include it in the game I don't think it would be for a superficial reason (also I don't really see a location on the Alola map I would call a Pearl Harbor parallel unless they really downplayed it. However, as we've talked about months ago when I brought up the topic, GF probably would rather ignore controversy and not include it).
And remember if you see any hints of Sinnoh in Alola look for other hints of the other regions. GF loves putting in references to the other regions so it's not really a surprise if we see "hints of Sinnoh" especially if its alongside of references to other regions.
I would say the only real "hint" so far is the Munchlax if you compare it to XY Torchic, but would they really be that predictable? Also let's put it in focus: the significant thing about XY Torchic was it able to become Mega Blaziken; it was a Gen III Starter who at the time was the only one of its trio which could Mega Evolve. Munchlax evolves into Snorlax; it's a family of Pokemon not part of a group and the Pokemon you get, a Gen IV Pokemon, evolves into a Gen I Pokemon. AND considering the major Gen I pandering we've been seeing is it the Munchlax we should be focusing on or the Snorlax? Afterall, Snorlax is the one getting the Z-Move, Munchlax is just a means to an end. And Snorlax is a popular Pokemon, especially now that it can use PULVERIZING PANCAKE!
Also, remakes usually happen for new consoles. GBA had FRLG, DS had HGSS, and 3DS had ORAS. Unless they count the New 3DS as a new system and make a Gen IV remake just for it, Gen VII might be another skipped remake gen. But playing devil's advocate, Gen VII has done a major visual overhaul so if they maybe go by game engine for remakes then a Gen IV remake could be possible.
But honestly, we just don't know. It's too early to start guessing a Gen IV remake when the newest games aren't even out yet. About we give Sun & Moon their day in the spotlight and then a year or so from then start asking about the next games GF has plans for.
Sun & Moon Trial Version:
Nice to see that they decided after the ORAS Demo data mine they're still giving us a sneak peak of how the game will play. Though now one must wonder exactly how the game is going to play out. My guess is that they'll build this demo from the "ground up", instead of just chopping off a chunk of the game leaving whatever was in there still in there they'll instead pick and choose what gets put in this demo (sort of like a fanmade game using a existing game's assets). Why build it from the ground up instead of just deleting stuff from the chunk of code they take? Deleting stuff could end up breaking something, and you could spend WAY more time fixing it then just having built it from scratch.
However this does raise the question of the content of the demo. Will it be like ORAS demo or will we go back to the short gameplay demos they used to have in game stores? The latter would be easier to do building it from scratch as you wouldn't have to add that much, BUT it would limit what they can do with it and probably have no connectivity to the main games which what made people interested in the ORAS Demo.
For right now we'll just have to wait, hope for the best (ORAS Demo or better) but expect the minimal (game store short demo).