You will have to wait for the official release of WSS SP2 a couple of months. In the mean time however, you can try it out already! TechEd visitors may have picked up a BizTalk 2006 CTP DVD, or you might have a download of Windows Server 2003 R2. Well, the good news is that you have WSS SP2 on those images. Jan and I tried it out and yep, it is the real thing: SharePoint on ASP.NET 2.0 :-)