Most likely this is just a Fox Home Video repack of the existing (and soon to exist re:EpIII) DVDs. This happens all the time as sequels in franchises come out. Heck, look at what Paramount did with the Star Trek films- the first DVD versions all came out in a box set, then as each 2-disc director's edition came out sequentially they just repacked the box sets over and over again as 'new' sets. Or the Blade trilogy... there was a 2-disc box, then when part 3 came out the studio repacked into a 3-disc box, etc etc etc. The LOTR releases were the same way.

It doesn't take much money for a studio to create a cardboard box and pack in some existing dvd releases.