Horizon remaster will be interesting. I imagine the tech team used it as test-bed for upgrades to Decima.
So it'll be nice to see what improvements we have, and if RT can be added to the engine, and how the engine will be more properly incorporated into the PRO.
As for the other remaster, could be 1st party or 3rd. There were rumours at one point about Gravity Daze 2. Maybe it's that.