That a documentary made in 2004 wasn’t shot in HD, (if only to future proof it) is weird.
So if anything, we’ll get an upscaled version of it
I feel like we don’t really know.
Did the guy who blabbed about it provide any kind of details?
Just that there were delays with Lucasfilm giving him the prints of the unaltered footage and that he was worried that if they wanted it soon they’d have to upscale things. This was about two years ago though.