Agreed, perfect summarySo after taking a day to process what I saw (and with a little help from some other posters' replies), I think I've figured out what's going on here. Jules can correct me if I'm wrong
During the events of PIC season 3, we find out that Section 31 stole Kirk's body from Veridian III and was storing it at Daystrom Station. By the late 25th/early 26th century, technology was available to bring Kirk back to life, but only from the point where he died, and only for a short while. Kirk is then taken to the Enterprise-J, where he 'awakens' and thinks he is in some sort of afterlife. He meets Saavik, Sorak (Spock's son), an old Wesley Crusher, and descendants of his friends and family. He then meets Yor, who gives him the ability to travel to the 23rd century of the Kelvin Timeline, where Kirk is able to reunite with the dying Prime Spock (but not before Kirk is in 'limbo' where he sees past versions of himself a la 2001 A Space Odyssey.) They both look off into the sunset (the implication being that they have now both died), the same sunset created by the sun which Gary Mitchell now hovers in front of, observing it all...
Is that garden actually in the Enterprise-J, or does it just look similar? That's the one thing I'm not 100% sure on yet.