I absolutely love my Windows Home Server -- it has made my life easier! If you don't know about WHS, please visit the Windows Home Server page, which has great details about the product. My favorite feature is the automated backup. No more reloading PCs in my house, I just restore to one of the recent backups that happens automatically, and I'm good to go. It's also great to have all of my media in one central location.
On to the update...the Windows Home Server team blog announced (yesterday) that Power Pack 2 will be available via Windows Update, and will install today (3/24/09) automatically, if automatic updates are enabled.
For more information about the update, visit the WHS Team Blog. This is a great source of information for WHS enthusiasts.