Even somebody who attended in May-July 2012 would probably get several new skills + helpful followup sessions from attending in April-July 2013. In particular, the pieces of the curriculum fit together into a coherent picture of rationality far better than they did last year.

I attended May 2012 and March 2013, and agree that the difference between them is perceptible. The coherence is the largest change. There were several changes in focus and presentation that made things significantly better.

For example, in May 2012 there was a session about installing and using Freemind and yEd that didn't go particularly well (if you hadn't preinstalled them, you couldn't follow along because the internet was slow), and in March 2013 there was a session about implementing Getting Things Done with Google tools and Boomerang (which also had internet troubles, but was designed as an installation tutorial you could do at a later date). I only use Freemind and yEd sparingly (the first has been almost completely replaced by Workflowy), but a capturing and reminder system is far more valuable.