From the TWOK 'workprint I saw.......
Carol/David extended intro conversation
Kirk reprising the 'blind as a tiberian bat' line as the orbit Regula
McCoy recognizing Terrell and mentioning they had served together
In the acedemy corridor as Kirk walks toward the lift, Spock says, "Something oppresses you."
Carol's Genesis naration was also re-recorded to imply more 'life-giving' properties--to give the audience more implication that Spock might have a chance at return
When Saavik says Reliant is near, Kirk says, "Isn't Chekov on Reliant?"
And the workprint contained virtually everything that CaptainBearclaw mentioned.