FreeBSD 6.2-release with freebsd-update upgrade process:
Mail#uname-a
FreeBSD mail.extmail.org 6.2-release FreeBSD 6.2-release #0: Fri Nov 2 13:04:30 UTC 2007 qiao@qiao.lpzq:/usr/src/sys/i38 6/COMPILE/KERNEL_IPFW i386
Mail#freebsd-update Fetch Install
Looking up update. freebsd.org Mirrors ... 1 mirrors found.
Fetching public key from Update1. Freebsd.org ... done.
Fetching metadata signature from Update1. Freebsd.org ... done.
Fetching metadata Index...done.
Can complete the FreeBSD bianary upgrade.
Then why can't you see it with uname? is because the uname reflects the kernel-level situation. Just executing freebsd-update does not touch the system kernel, but the system has actually been upgraded. Then, to be able to reflect on the "uname-a", you need to follow the following command:
Mail#cd/usr/src
Mail#make Buildkernel Kernconf=yourkernel
Mail#make Installkernel Kernconf=yourkernel
Mail#reboot