Some new details have reportedly leaked out of closed testing for Battlefield 4: Second Assault, the upcoming expansion for DICE's 2013 shooter that promises four Battlefield 3 maps revamped with the new game's enhanced environmental destruction features (a href="http://mp1st.com/2013/11/18/new-battlefield-4-second-assault-footage-details/">via MP1st.com:

“So I just spent a few hours playing the 4 new second assault maps,” he writes. “Metro, Oman, Caspian and Firestorm. Metro looks great, with new paths, fire that spreads through the grass outside and the ability to kill the lights. Oman looks very similar except the beach is now super rocky providing good cover and the sand storm is crazy! Caspian’s new wall makes a big difference in the flow of vehicular combat. Firestorm is extremely fiery now. Lots of gas leaks that will kill people standing too close.”

LevelCapGaming's reddit posts go further to describe some of the specific 'levolution' features of each map, noting that Caspian Border's tumbling tower now creates a bridge to the hilltop capture point, Gulf of Oman gets a huge mid-session sandstorm, and Operation Metro has functioning elevators.

A new official trailer for Second Assault is expected in the next day or so, and the pack itself is due to launch 'exclusively on Xbox One' on November 22nd, which if it's anything like the BF3 schedule, means other platforms a week or two later.