There has been evidence of this new remastered original trilogy slowly building online over recent months. This is due to the restoration company posting short clips to a quiet unknown YouTube account.
Check out this video on an explanation on what has been happening and a comparison between the new remaster and the current 4K discs.
TLDW: The new remaster looks way better than the current discs.
Then check out this 17 minute compilation of remastered original trilogy clips that have appeared online so far.
Didn’t they update that scene twice? The first Special Edition release and then updated the Jabba CGI a second time for another release. (The Blu-ray’s? I’m not sure)
It’s all a bit moot anyway as everything in the “new” Jabba scene is almost a repeat of what was said in the Greedo encounter a few scenes earlier.
And they forced in Boba Fett which was cool at the time but just seems out of place now.