Fortunately, we can expect ROTJ:R to have the "NOOO" removed.

As for ESB:R, the only dialogue I would want added would be any dialogue that was removed in previous versions, as has happened in just about all the OT in their various re-releases, unless it seems better without the addition.

Ady would know far more than I would, but it seems to me that there aren't a lot of audio changes needed. Other than the lightsaber strike on the floor that I mentioned a few posts back, there's the timing of the lightsaber turning off in the wampa cave that needs to be fixed, restoring the sound Vader makes when he is kicked off the edge by Luke, and... well, that's all I can think of.