This was posted almost a year ago on another board...
After many years of speculation Warner Brothers are currently re-scanning Dallas from the original 35mm masters for a complete HD restoration. The project has been on going for several months. Seasons 10-13 are being reconstructed from the original elements as they only currently exist in one inch video SD master tape.
The project will take quite some time to complete but the plans are to have Dallas stream on HBO Max and eventually stream globally with an eventual Blu Ray release (possibly in time for the 45th anniversary in 2023) . Warner are also looking at restorations for Knots Landing and Falcon Crest. It's just going to take time!