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The details he announced regarding the 3D Blu-Ray edition of Transformers: Dark of the Moon was that it will be a four-disc set, released on the 31st January 2012 with the disc breakdown being:
Disc 1 - Transformers: DOTM Blu-ray feature film
Disc 2 - Behind the Scenes (the extra that have been missing for every release so far)
Disc 3 - Transformers: DOTM 3D Blu-ray edition
Disc 4 - Transformers: DOTM DVD / Digital Copy
With regards to the 7-disc set, Nelson just gave the release date as Jan 31st, said it would contain all three films (Transformers, Transformers: Revenge of the Fallen, Transformers: Dark of the Moon) and that he will be announcing further details on Boxing day, so December 26th 2011.