I’ve heard a rumor from a trusted source that the next version of Learning Ext JS is being written, and it may be titled Learning Ext JS 3.0. It will be updated to reflect working with version 3.x of the library, and have at least three new chapters added. If it is published in 2010, this could be a great year for Ext JS books, with Ext JS in Action scheduled to go to print in June.
UPDATE February 10: Confirmed! I’ve been asked to be a Technical Reviewer, and I’ve already received 3 chapters to review! This is going to be a great refresh for what I think is the best entry-level Ext JS book.