I'm waiting for Battlefield 4, but I really didn't expect them to go this far with its second screen functionality. In the video below dubbed "Battlefield 4: Official Battlelog Features Video" we get a much better look at the second screen abilities of Battlefield 4.
Players will be able to use their mobile devices, such as an iOS- or Android-based smartphone or tablet, as a huge accessory to BF4. Not only that, you could use your tablet as a second display, which would show your map with gamers being able to use them for in-game tactical moves, such as tapping your tablet screen to set a meeting/bomb drop point.
Commander Mode would make the best use of the second screen, but I can't wait to just have a large-sized map to the side of my monitor.