EA's Battlelog has details on how to pick up Battlefield 4 Second Assault for free for the coming week, offering a 100% discount on this DLC for owners of Battlefield 4. In the same update they also offer details about a new community challenge in the military shooter sequel that will reward participants with gold backpacks (perfect camouflage for battles in Fort Knox) if the community can manage 25,000,000 collective revives over the next week. Battlefield 4 Second Assault includes four maps that hearken back to the old days of Battlefield 3. Here's a trailer promoting the giveaway. Thanks Don.