Prior to their bankruptcy, MGM struck a ton of HD masters of catalog titles for TV/on-demand purposes. They were showing up on MGM HD in the States, and the various MGM Channels overseas, 2-3 years before they ever got a physical release. (For example, the HD remaster of the Lifeforce director's cut premiered on MGM HD in 2010, but the Shout BD only came out last year.)

Many of these films are still unreleased on BD, but the ones that have gotten releases seem, by and large, to be derived from the HD masters that MGM already has on hand. Please correct me if I'm wrong.