It's far too obvious in the new footage that it's just an outtake of Vader arriving on the Death Star II. The hangar is the DS2 hangar, and what is Moff Jejerrod doing there (mouthing his ROTJ lines but with no sound coming out). That either needs to be removed, or some clever digital manipulation (insert Piett in there? Change the background?).
Fett's old voice needs to be kept! I don't see why voice filters are such a crazy idea... Leia had it with Bousshe, Anakin has it with his Vader suit. It's scarier, and we're left to imagine why his voice sound like that... what kind of a badass bounty hunter was he? Etc. The new voice sounds phoned in and unsure. Temura Morrison sounds like he's playing a Clone trooper, not Boba Fett. This is a cutthroat money grubbing head-hunter, not some brainwashed cannon fodder soldier.
This might be a stretch, but to me the new and old wampa footage doesn't quite match. If something could be done to make them match more closely, that'd be great.
And Luke's saber off sound as he's leaving the cave either needs to be removed, or the saber needs to actually shut off to match the sound effect.
I wanna hear "you're lucky you don't taste very good" again too!
And no more pink/orange sabers for Vader!
Best of luck Adywan, it's going to be another fun 20 months waiting for this one, once you've finished ANH:R!