Earlier this week, we got beta 4 of Zend Framework 2 out of the door. This version has some very significant improvements in it which mean that if you're following along at home with the betas, then you're going to be doing a bit of updating! Most of the B/C breaks are noted in this thread.
He's also made updates to his Zend Framework 2 tutorial to match these most recent changes. He points out three key new features - the ZendServiceManager, ZendForm and ZendInputFilter updates and the introduction of Composer support to pull packages.