Naval Strike is the third of five planned Battlefield 4 expansions due for release by the summer of 2014. They can be pre-purchased as part of the £39.99 / $50 Battlefield Premium subscription offering. The other four expansions are Second Assault, China Rising, Dragon's Teeth and Final Stand.
DICE recently confirmed that Dragon's Teeth will feature the addition of a ballistic shield. The two-handed shield will serve as mobile cover in the DLC, which is set to focus on urban warfare.
During a GDC session earlier this month, senior animator Ryan Duffin said DICE initially wanted to create a shield which players could use in combination with handguns. However, development schedules and last-gen hardware memory constraints meant the feature couldn't be implemented. Instead, players will be able to melee with the shield, which has an attack range of about one metre.