Yeah, in my humble opinion, merely recompositing original elements doesn't constitute a "change," per se.
I'd also hope against reinstating matte lines and, even worse, garbage mattes for the same reason you elected not to mess with any of the Hoth battle.
Honestly, the Rancor scene in ROTJ is the only one I'd waver on, but even then I'd ultimately hope for leaving it the new way.
But hey, we're all purists here. I'd also be interested in initial thoughts on what changes you think will be outside your sphere of influence.
As always, I'll be silently watching, spellbound.
EDIT: Y'know, as surprisingly close as Harmy has come to a flawless restoration even down to the details, I've had a change of heart on this issue and wouldn't mind any matte lines or other warts to be restored. :)