It's been said, but what the hey...
There will not be one. There is no need for one- every extra brought in with Crystal was included in these remakes. The entire Suicune/Eusine storyline was implemented, which was one of the biggest things in Crystal. Also, not only was the Battle Tower put in, but the whole Battle Frontier was, and in the same place the Battle Tower was in Crystal. To further strengthen the unlikelihood of there not being a remake, they didn't do it for FireRed and LeafGreen, and they barely included anything new (well, the Sevii Islands, but whatever, Kanto was relatively the same). HG SS have everything plus extras, so there is no need for a third, and virtually no possibility.
[/thread]
damnit, something else to say... "Heart" and "Soul" both refer to "Body" and "Mind", so they've covered it, there's no name left for a Crystal remake, really.