INFORMATION DUMP BELOW:
Theatrical Cuts for The Motion Picture, II: The Wrath of Khan, III: The Search for Spock, and IV: The Voyage Home received new 4K remasters. Those remasters were released on 4K+BD physical release formats last year, 2021, and are vastly superior to the discs released in 2009. (I’ve already sold the 2009 BDs of TMP, TWOK, TSS, and TVH. Kept the 2016 BD of TWOK.)
STAR TREK II: The Wrath of Khan - Director’s Cut was also part of the 4K remaster re-releases, but unsure if the audio is different from the 2016 BD regarding the dialogue. The 2016 BD uses 24-bit audio for its main track, whilst the 2021 4K+BD remastered release utilizes 16-bit audio. Personally, I haven’t done an A/B comparison regarding both discs. ABC Cut is still its own thing and still hasn’t been officially released.
STAR TREK: The Motion Picture - The Director’s Edition has a brand new iteration for this year in 4K. Will be released physically on 4K+BD in Septermber with legacy and all new bonus features. So yes, this 2022 TDE is different compared to the 2001 TDE. The same exact team who worked on the older iteration of the 2001 TDE, made for and released on DVD in that resolution, also worked on the 2022 (released) TDE which was made with 4K in mind. Just MAYBE, the SLV scenes, and all deleted scenes which were included on the 2-Disc TDE DVD, will be remastered and presented in 1080p quality. Theatrical Cut received a 4K remaster and released 4K+BD in 2021, which is vastly superior to the 2009 BD. (Repeating information for specific film.)
So, all that’s being waited on for STAR TREK VI: The Undiscovered Country to receive a full 4K remaster, i.e. TMP-TVH which includes a physical 4K+BD release, and have all main cuts. Most assuredly the Theatrical will be presented in 2.35:1~2.40:1 aspect ratio, while the original DVD and 2-Disc DVD iteration of the Longer aka Home Video cut, would be presented in 2.00:1 or whichever aspect ratio it was. Since the Theatrical Cut is in a different aspect ratio compared to the LD/DVD Longer Cut, two separate discs would need to be used when taking into account for the 4K remaster. Since the LD/DVD cuts are the same aspect ratio, the disc can have seamless branching. Again, when this remaster is released physically, the 2009 BD will be obsolete.