As you know Microsoft has renamed Groove 2007 to SharePoint Workspace. With the 2010 release, SharePoint Workspace as well as OneNote will be available in the Microsoft Office Professional Plus SKU. Finally, I got some time to upgrade Office 2007 to 2010. My biggest concern was my Groove 2007 documents. I created a backup and restored them onto the SharePoint Workspace. Everything looks good.
Also, when creating a workspace, you have an option to choose either 2007 or 2010 version of the workspace.
You can see the 2010 feature details on the following link: