"Next-Generation Puppet Server Improves Performance by 3x, New Puppet Apps, Management and Reporting Capabilities Extend the Productivity and Efficiency of DevOps Teams".
In a few words Puppetlabs strongly improved their software and pushed all the new features in the new PE major release.
Native clients, new way to write modules, Puppet apps, new server with built-in node manager and metrics, and a growing request of Puppet skills put the new release on top of the DevOps solutions.
Take a look at the official announcement @ Puppetlabs website
Can't wait for it!