@jahonix:
And if you look here:
http://snapshots.pfsense.org/FreeBSD6/RELENG_1_2/updates/
you'll find 1.3 builds and NO warnings!
Uh oh - thanks jahonix, I removed those. They should have never been there.
knakkergaard: I think you must still be trying 1.3. The 1.2RC3 images from here are what you want:
http://snapshots.pfsense.org/FreeBSD6/RELENG_1_2/updates/
though at this point, you probably need to reinstall with:
http://snapshots.pfsense.org/FreeBSD6/RELENG_1_2/iso/