The beta for Office 2010 and SharePoint 2010 Service Pack 2 is available for download.  For the details, see the Office Sustained Engineering blog post about the beta release

You probably have your update process in place. But just in case, have a look at these resources:

Remember, after you apply updates to SharePoint 2010 Products or to Office Web Apps running on SharePoint 2010 Products, run the SharePoint 2010 Products Configuration Wizard. Or, at a command line, on every server in the farm, run:

psconfig –cmd upgrade –inplace b2b -wait

Happy patch testing!