Ok, Tibs, I don't know why I even thought I could assume you knew what you were talking about. What you read about is Windows Home Server "Power Pack 1". It is a minor, free update to existing home servers that adds some new features and refines a few things that already exist in WHS.
This is not a new version, nor is it called Windows Home Server '08. You need to understand that Wikipedia is not always a reliable source of information and that you should better try to
understand what you're reading rather than just take it for what is printed. The best piece of advice I can give you, and anyone else, is to always question
everything! Anyways, when in doubt, try to find the original source for something. Here is a post from the WHS team blog about Power Pack 1 that gives the true scope of what this update is.
http://blogs.technet.com/homeserver/archive/2008/01/06/windows-home-server-power-pack-1.aspx