One of the key criticisms of Access 2007 was the new ribbon. Gone was the familiar command bar, and with it, many thousands of hours work by the Access developers that came to rely on the command bar as the main user menu.
Microsoft has invested in making life a bit easier for the everyday user that wants to customize the ribbon without custom code or the nice (free no less) utility Claton Hendricks created.
As you can see in the screenshot from the Office 2010 Tech Preview, you can create custom ribbon tabs and groups. In the preview, it doesn't appear that you'll be able to change any of the packaged ribbon tabs and groups, though.
Stay tuned for more on Access 2010 Web Form design and other enhancements...