I'm pretty confident this exists.
It'll be Bandai Namco's series stopgap letting them milk popularity without having to invest into a full title production, and prevents them butting heads with Miyazaki's disinterest in continuing the series. Given the series growth returning to Dark Souls is ideal; it's a last generation title and perceptually dated in production quality compared to Dark Souls 3.
The extent of the remaster though? Who knows. A simple up-port would be disappointing, as I'd like some new bells and whistles, though perhaps that's why the rumour hasn't so far included a PC release. I'm also convinced a Switch build is absolutely in the works.
I would have preferred Demon's Souls as it's the big one of the four that could really benefit from a re-release that capitalises on the series fandom. And even though it's not Dark Souls, it is in style and play. I don't need to replay Dark Souls, and if I do I'd prefer to play it on PC where I can crank the settings and tweaks likely beyond what this remaster can even offer. That being said, having Dark Souls on the go would be a treat.