I'd say switch the sources.list to 'stable' or 'wheezy' for a few weeks. After that, switch back to 'testing' and run "apt-get dist-upgrade --assume-no" and see

I'd say switch the sources.list to 'stable' or 'wheezy' for a few weeks. After that, switch back to 'testing' and run "apt-get dist-upgrade --assume-no" and see what Debian is going to upgrade. There is no real proper way to do this, other than testing in a VM, or a chroot.