It’s Official, Second Assault is coming for X360, PS4, PS3, and PC on February 18th, and being released for all users on March 4th, two weeks later.
From the Battlelog post:
“In a week, you’ll take a step back in time with Battlefield 4 Second Assault, featuring four fan-favorite maps from Battlefield 3 – Operation Metro, Caspian Border, Gulf of Oman, and Operation Firestorm. Reimagined with Frostbite 3 graphics and Battlefield 4 gameplay, Battlefield 4 Second Assault will be released on February 18 for Battlefield 4 Premium members on PlayStation 4, PlayStation 3, Xbox 360 and PC, and for all Battlefield 4 players two weeks later on March 4.”
Also, Naval Strike will be released in late March for premium users, with the release for all platforms two weeks later, as is usual.
“Following Battlefield 4 Second Assault will be the third expansion pack, Battlefield 4 Naval Strike, launching in late March for Battlefield 4 Premium members. Stay tuned for the exact date and find all expansion pack information on Battlefield.com. In this expansion, you’ll experience intense water-based combat as the Chinese armada takes the fight to the sea. You’ll have access to new weapons, gadgets, and amphibious vehicles, and four all-new maps – Lost Island, Nansha Strike, Wave Breaker, and Operation Mortar.”