And actually, there were issues with this as the only existing masters for Gravitation (even what was used for the Japanese DVD release) have some problems.
Nozomi sent a notice to ANN regarding the potential quality issues and lack of Japanese Blu-ray release stating, “We’re really excited to be bringing this upscale to the fans because there is no HD source for this and no Blu-ray in Japan!
The set is priced at $39.99 listed at 385 minutes with extras that include: TV Series Clean Opening and Closing, OVA Gravitation Sneak Previews 1 & 2, OVA Clean Opening, OVA Clean Episode 1 Ending.
Gravitation Complete Collection HD Official Trailer