I was just reading the Wikipedia entry on the "List of changes in Star Wars re-releases" and I found a couple things that might be cool.

Deleted Scenes said:

In the carbon-freezing sequence, C-3PO's complete line would have been "I'm not ready to die on the back of a demented wookiee!" (the italicized words were deleted from all versions of the film, but were heard in their entirety on the Story of The Empire Strikes Back LP).

That'd be interesting to hear, and maybe squeeze in if its not too distracting.

Changes to 2004 DVD said:

When Luke confronts Vader in the carbon-freezing chamber and ignites his lightsaber, the sound from the original release is overlapped in this scene by the sound produced by Luke's new lightsaber in Return of the Jedi.

Since you're redoing most of the sound, I'm sure you'll fix this.

Film Changes said:

# After the Probe droid lands and moves left, there is an optical wipe to the overhead shot of Luke on his Tauntaun.
# After Luke wanders through the snow and falls face down, there is an optical wipe to Han instead of a straight cut.

Have you tried restoring/adding these wipes? I was pretty confused at the phrasing of the 70mm vs 35mm in the article. But I think a wipe might be useful in the first scene especially, to show that we're actually traveling back in time to before the probe landed.

Also, the article mentions ANHR, which is pretty cool.

EDIT: And though the article doesn't mention it due to gross clerical error, there is an errant slowflake on Chewbacca's foot. I don't know if anyone has mentioned it here yet.