Dragon Quest X - Mezameshi Itsutsu no Shuzoku Online (Japan) (Beta Test-ban) has the category "Preproduction", but this was an officially licensed and released disc. Not a preproducation one. It may have had pre-final software on (or software that used a pre-final server) - I don't actually know, but its not a pre-production (e.g. developer) disc.
Able to dump: GC , Wii, Wii U | GBA, DS(i), 3DS