ImperialFighter said:

I seem to recall that a replacement 'Shield Generator' and 'inside of Asteroid Slug's mouth' are also being done. And I also seem to recall that a 'Hoth rebel trench' is being planned too!

There's certainly plenty of neat stuff mounting up to be covered for the behind-the-scenes extras disc. :)

The Asteroid Slug's mouth could use definite improvement, now that you brought that up.

I too recall mention of the shield generator, and the trenches.
The bonus disc is actually what I look foreward too most :)