from Scifi Wire
Rick Berman: "...we have a two-parter dealing with a mirror universe, the same mirror universe that was visited in [the] original series, 100 years in the future, and also on Deep Space Nine, 200 years in the future."
from Trek Today
Manny Coto: "We're really excited about that one. It'll be as if you changed the channel to Enterprise and you get the mirror universe version of the show. We're even going to change the title sequence. People will be wondering, what show is this?"
Reportedly opens with an angry mob attacking the Vulcans as they attempt to make first contact with Earth on April 5, 2063.