...Okay, seems the MU is done with, and perhaps done for, as of now. No references to Empress Sato, except perhaps for the current Emperor having a Japanese lineage. Nothing concrete coming out of "In a Mirror, Darkly", as the spatial rift there remains unusable for reasons already well laid out in TOS "Tholian Web". We don't get to see anything from the 2150s, no relics, no people. All the references we do get are to TOS "Mirror, Mirror". Chapter closed.
Except we now have a witness, a hostage, a guest, a whatever. Perhaps that witness will eventually be musing about the good old times?
Timo Saloniemi