At Senchacon, I announced "Ext JS in Action Second Edition" (4.0). With the first edition done, I'm already hard at work on the next one. I can't discuss the TOC in its full entirety yet, but I can tell you that I will be covering Direct and the MVC architecture in part 3.
As soon as the MEAP (Manning Early Access Program) is opened up to the public, I will release the TOC.
More news to follow.