Was it the release of Dragon Ball Kai in Japan, itself a “refreshed” version of the show in high-definition? Did the license fee for the “Dragon Box” masters (perhaps also due to Kai) reach a point that it became viable and potentially profitable for FUNimation to release them?
In July 2011 at their industry panel at Comic-Con in San Diego, FUNimation announced a new Blu-ray release of the standard Dragon Ball Z TV series (non-Kai) for release later that year. It was later clarified to be an entirely new remaster, separate from the “season box set” DVD ...