Senior Creative Director Jens Andersen says that this update will get players to see the game from a whole new perspective: "Players are getting more than just a new storyline with this DLC. We transformed Metropolis for the War of the Light trilogy and created new, expandable environments and content -- separate from the original -- for players to explore."
The DLC also includes the tanking rage powerset, more 4- and 8-player operations, plenty of Green Lantern gear, and the Legends PvP characters of Saint Walker and Atrocitus. The update is included with a subscription or can be purchased separately for $9.99.
[Source: SOE press release]