Well, how did you "upgrade"? It appears that this was either a "live" upgrade via YUM, or a CD/DVD or network upgrade (all as opposed to a fresh install). The easiest way to sort this out is probably to manually review and edit all of your files in /etc/yum.repos.d/ and ensure that they are pointing to the correct repos (F10, not F9). Also, check:
rpm -q fedora-release
Should be F10.