I kind of doubt they will make remakes for Gen 4 this generation. They only do remakes for every console that comes, not every generation, as proven previously by the last three remakes (FRLG was on GBA, HGSS on DS, ORAS on 3DS). Plus DPP is technically playable on 3DS backwards compatibility and DPP mons can be transferred to the 3DS games and BW so there's not much of a reason to make them atm. Unless they do something wildly different I'm expecting DP remakes to come at earliest in two years and on the Switch, after Pokemon Switch comes out (presumably next year at earliest, possibly later). I don't imagine they'll come any earlier than 2019, however.
Anyways, onto Ultra Sun and Ultra Moon...they're looking more interesting the more they reveal. It looks like some sort of alternate story or something related to the original SM, but it's looking to take a darker direction story wise kind of like Gen 5 did. We'll see more of the Ultra Space universe, and Necrozma looks like it'll take on a sort of antagonist role in the story. And the Ultra Space seems to have several environments where various Ultra Beasts come from, which looks interesting. The Ultra Recon squad and the idea of people living in Ultra Space seems...really weird but I'm interested in seeing how it pans out in practice. The new UBs look interesting too.
UB Burst and Assembly look interesting, I do wonder how they'll fare in the competitive scene. Assembly's typing looks meh but Burst looks to be something. Hopefully we'll see more of those two later on (and what their real names are).
Oh and also the game looks to have a lot more of some fun features. Riding Solgaleo/Lunala through Ultra Space looks like a lot of fun to do, and riding Mantine also looks awesome.
Anyways, just a few thoughts. USUM is looking more and more interesting along the way...can't wait for it to release.