That the temporal cold war was responsible for certain changes in canon, such as the Eugenics War happening in the 21st century rather than the 1990's. That's been a popular theory on Daystrom since long before last week's SNW.
effinstephen
joined 1 year ago
The Temporal Cold War has made ripples in the timeline. The Romulan time traveler in "Tomorrow and Tomorrow and Tomorrow" strongly hinted that history was at least a little bit different than it had been, with the date of the Eugenics War as case in point. I think the writers are freeing themselves up to make minor changes to canon. I don't think it's a branching timeline, though, it's still Prime. Just a little bit different, like Gabriel Bell being replaced by Captain Sisco.