Actually, they're just adding Nos. 4 & 5--the stand-alone discs of Godfathers I & II.
It's basically Paramount's top-of-the-line BD program (in case you didn't get it, sapphires are blue
). Every title so far has been an Oscar winner for Best Picture, though there's nothing set in stone that says future titles have to be. (The best hints are NO stand-alone Godfather III and NOT including The African Queen--a classic, but NOT a Best Picture winner.)