Second assault was a release day launch for XboxOne and with the problems concerning the state of the online multiplayer. DICE suspended ALL DLC until the game is in a stable state. After several patches and a looming law suit, BF4 is looking a lot more healthy now. Crashes have all but stopped, leaving only balancing and a few minor bugs to fix.
A tweet by one of DICE's developers, states Second Assault should be out in the month of February. Microsoft, have timed exclusives to all BF4 DLC. But the amount of time its taken to get this far is a joke. It wasn't as if the maps needed work as they where ready for the XboxOne launch. Either way, all formats will have the new maps along with the new weapons, including the F2000, AS-Val, M60E4 and the DAO-12. Whether DICE will still honour the premium 2weeks, who knows. They must get fans back on their side and draw a line under all this ASAP.