Microsoft SharePoint 2010 reached the Technical Preview stage, an engineering milestone. In this regard, Microsoft is offering is a sneak peek at SharePoint Server 2010, essentially a collection of feature descriptions and videos made available through following link. Customers will be able to access a SharePoint Server 2010 Sneak Peek FAQ, an overview of the product, a video version of the overview, but also video content tailored to IT professional and developer audiences, as well as materials instructing users on how to get ready for the successor of SharePoint Server 2007.
Note: I tried to visit using the link, but it ends 403 forbidden error!!!
More info: SharePoint Server 2010 SneakPeek