Avatar: Special Edition

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Originally Posted by nekromantik

they are probs not 3 full different versions of the movie.
Seamless branching means they can have the added scenes from the other 2 cuts on the disc and then you can view them within the movie.

Yes this'll definitely be what they've done, and generally what happens when you have different cuts of a movie on one disc (the new Alien Anthology will very likely use the same technique).

However since the original barebones release supposedly filled a blu-ray disc to its capacity to make it look and sound the best it possibly could, adding that extra footage IS probably going to mean that the space the original theatrical cut takes up will work out to be less (with lower bitrates perhaps), am I right? Though, I'm sure it will still look great.