The EVE Online Website announces that the new Retribution expansion has is now live in CCP's sci-fi MMORPG. This page has the full set of build 457011 patch notes, and the Retribution features page has all the details on the new content this brings. Here's the short form:

This latest expansion brings a refactoring of the bounty system and better handling of kill rights, the new Crimewatch, rebalancing and ship roles of all T1 Destroyers and Cruisers, 4 new Destroyers, a new mining frigate, a big update to the tactical combat UI, upgraded NPC AI, an improvement of the sound system, and a lot of small changes that will make life in New Eden that much more easy and interesting.