It won't be a remaster though. At the very least it will be a third version, but judging from how SM ended I'd say it's more likely to be a sequel set in Alola. Unless sequels are considered remasters or ports (cough Splatoon )
If it's something like Emerald/Platinum then it's a remaster/enhanced edition, the content is too light to be something else
If it's like Black&White2 with a new story, new protagonists, new régions/arenas then it's a sequel
If it is really called "Stars" it doesn't sound like a sequel, at least if you look up at what they did before
Besides I loved SM (I still need to finish the Counsel 4) but I wouldn't play it again on Switch if it was just a remaster, way too linear and rigid, without enough choice in the Pokémons you encounter (that Gen1 is still everywhere...) or sidequests