Quoting major new features from his blog post:
- Significant performance improvements when loading datacenters and clusters.
- New top-level container nodes to facilitate viewing objects without having to browse into the Managed Hosts node.
- Links allowing you to browse into log files from hosts.
- Support for the VMware VI Toolkit 1.5 release.
- VMotion support for virtual machines.
To upgrade from 2.0 simply delete the old folder in PowerGUI and import the new one.