343 Industries just debuted a new video showing off the next Halo 4 map pack. The Castle pack will be available on Xbox Live on April 8th and features three new maps for Halo 4 multiplayer. Here is the official pack description courtesy of Halo Waypoint:

Daybreak places you amidst military facilities, against the backdrop of an idyllic mountain range, while Outcast plunges you into the natural tunnels and arches of a secluded rebel outpost, and Perdition takes players into the heart of an urban crisis, with tactical speed and situational awareness its key features.