The Enterprise established to have a length of roughly 300 meters.
Not going to happen.
Nor does that bother me in the slightest either - it's easily explained away with the timeline change, like they decided to make the constitution class bigger from the outset along with other military decisions.
Meh.
It's Schroedinger's starship.
The ship is both 366 meters or 725 meters until it is explicitly shown. The ship exists at all previously mentioned sizes until it is actually mentioned in dialog or numbers are shown physically on screen and added to canon. The size of the ship right now depends completely on plot and graphics designers.