Lots of things happening on the GG remasters front:
1. As well-documented here, DRT Entertainment (Derek Shulman's label), has re-released In a Glass House, Free Hand, Power & the Glory, Playing the Fool, Interview, The Missing Piece and Giant for a Day. Supposedly an anthology is coming (see above) but time will tell. Also, the word is that DRT had trouble obtaining rights to the first four GG albums.
2. Three Friends has recently been reissued on Universal Japan. I have heard some not-so-good things about the remastering - It is apparently very bad.
3. Acquiring the Taste has been reissued on the Repetoire label - I have heard it and it is wonderful.* They are supposedly close to obtaining rights to reissue Octopus and Three Friends, which would be great if the quality could be maintained.
4. There have been other re-releases on the Vertigo label, but they are now OOP. Edge of Twilight (a great early albums anthology) is still available on Amazon used.
* If you pick up the Repetoire Acquiring the Taste, make sure you are getting this one and not the Vertigo edition. The Repetoire is limited to 3000 copies.