Sure we all knew the next version of SharePoint is under development but today Microsoft has released an official Press Release refering to the next version of SharePoint as SharePoint Server 2010. Yep the name Microsoft Office is not offically part of the name but I would not read much into that. Read the press release at http://www.microsoft.com/presspass/features/2009/Apr09/04-15Office2010.mspx
Adding the SharePoint team blog post url: http://blogs.msdn.com/sharepoint/archive/2009/04/14/microsoft-sharepoint-14-is-now-microsoft-sharepoint-2010.aspx