Want some more structured information on the next version of SharePoint?
How about the Microsoft Office SharePoint Server 2007 Preview Site? Complete with a demo and a product evaluation guide. There is some marketing fluff (as expected) but hidden in there is some really cool information about new features. :) I encourage you to jump in, I did and the water is nice and warm.
http://www.microsoft.com/office/preview/servers/sharepointserver/highlights.mspx
And if you look around they have some other cool stuff previewing all of the Office stuff but we (me and my 2 dogs) only care about SharePoint. :)
Shane
SharePoint Help