Game Update 4 is now live in DC Universe Online and brings with it a new Fortress of Solitude raid, which you can see in the trailer below. Here are the patch's main features:

• New Raid – Heroes and Villains will join Superman and Lex Luthor in a legendary battle to the front steps of The Fortress of Solitude which has been taken over by Brainiac! Look for Battle for The Fortress in your Mission Journal to begin! 
• New Alert – Fight your way back into the depths of The Batcave and experience the Outer Caverns as a four player Alert!
• New PVP Map – Located in the heart of The Fortress of Solitude, this new Deathmatch arena puts 16 players in a tight and action filled map.  Containing new Power Ups and a trap room just waiting to bring the pain, it will quickly become a new favorite!
• Mission Journal Revamp – A new layout and sorting options will make finding your next Mission easy!  Need a hand?  Share Missions with a friend or Leaguemate!
• Body Scaling – In DCUO size does matter, and players can now choose brand new body types in Character Creation.

Just to be clear, this update doesn't include the ability to wield Green Lantern's light powers that were announced at SOE Fan Faire. Those will be added in the “Fight for the Light” downloadable content pack, which goes on sale later this summer.