The plans for the LDS Church holdings long North Temple have changed from the original leaked design. You can view the
design here as well as some information about it from the SL Tribune.
Since this was released, multiple things have happened that have changed the overall plan.
The biggest issue was the potential demolition of the old Hotel Utah (Joseph Smith Memorial Building). Then there is/was the creation of the Entertainment and Convention District. And then there is the West High relocation to the east side of 3rd West.
I have heard that the current Administration block (LDS Church Offices) would not be changing from its current state, meaning no buildings would be demolished on the block.
The block west of Temple Square though will end up being razed entirely during the next phase, additionally the plan is for West Temple and 2nd West (between South Temple and North Temple) to be bought by the Church and incorporated into their plans similar to what was done with Main Street.
I am not sure what is planned for the Devereaux Mansion, but the Triad buildings will be razed, likely the 3rd Phase. KSL will get a new broadcast center, likely during Phase 2. Ensign College will likely be relocated downtown.
The plans have changed a few times in the last couple of years and I do expect them to change again until the next phase is announced.
I don't think we will see much construction happening directly adjacent to Temple Square until after the temple open house ends in October of 2027. This means that the Deseret Book/Utah Woolen Mills building will likely be replaced with a mini park of some sort during the open house.
I don't think we will hear about the next phase of the LDS Church plans until the April 2027 General Conference. This would allow for the plans to go through the public review processes with the City for construction to start in 2028.
The PRI/CCR developments may start to move forward again next year, I don't know of any direct timeline for them.