#1 - May 5, 2011, 6:36 p.m.
Blizzard Post
Patch 4.2 is now available on the Public Test Realms! With a new raid, a legendary questline, the most diverse daily quest hub to date, major story developments, user interface enhancements, and much more, patch 4.2 is certain to have something for everyone.

Before you get testing, here are some major features coming in patch 4.2 you need to know about, followed by the latest patch notes: http://us.battle.net/wow/en/blog/2723732