Just saw this post:
SharePoint Foundation 2010 changes the method in which patches are installed. PSconfig no longer runs automatically after an update is installed. The SharePoint binary files are updated with the patch but the databases are not automatically upgraded.
This means that you are going to have to go in after installing SharePoint Foundation 2010 patches and run:
PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures
from the command line. Fun eh? according to the article you’ll see a error in the event logs indicating that the PSCONFIG command needs to be run. Gotta say this isn’t going to make supporting SharePoint 2010 Foundation (especially on SBS 2011) any easier!