Here is some thoughts on potential deleted scenes:
• Kylo Ren and the Oracle
• Extended Luke and Leia flashback (I doubt the visual effects were even completed)
• Maz gives Rey a pep talk before going to Pasana.
• Lando talks about his long lost daughter.
• Kylo kills Hux.
• Lando talks to Finn back at the Resistance Base.I feel like a lot of deleted material would be the trimmings of the scenes we mostly got, or original versions of scenes before they were reshot.
Add to this the shot of Leia handling the medal seen in the trailer (and given to Chewie at the end).
Nien Nunb is also seen in the rebel briefing but entirely absent in the space battle and the victory celebration (possibly his fighter is destroyed, but the tide turning against the rebel fighters was already represented by Greg Grunberg’s death).
Having just read the original plot spoilers, most of the deleted scenes would contradict the final edit (such as Kylo kills Hux) and so couldn’t be used in an extended cut. In the case of Rogue One Lucasfilm didn’t see fit to release any of that ‘alternate’ material so am not sure we should hold our breath in this case.