Steve has tweeted that, later this year, GTP and Tin Drum will be released on Abbey Road half-speed mastered vinyl. Tracks are the same as the orginals. There is a good explanation of the process in the link below.
https://www.udiscovermusic.com/halfspeed/
He was also asked whether there might be blu-ray / 5.1 remixes, but responded that Virgin hadn't looked after the multitrack masters and that they'd been destroyed, so there's no going back to source to do that.