aba@ries:~$ grep final update_out/update.OUTPUT_py | cut -f 2 -d ' '| tr , '\n'|wc -l
901

This means 901 packages went from unstable to testing with the most recent britney run (though counting each binNMUed source package as ~12 packages here). Only about 200 packages which are otherwise ready for migration tried to go to testing, the vast majority reached testing.

Major reason for this move is that now libselinux was ready, and we were able to migrate libselinux, pango, glib2.0 and ocaml which dependend on all of them (the last transition being responsible for about 700 packages).

Good news for armel as well:

start: 61+442: i-2:a-0:a-0:a-21:h-11:i-0:m-4:m-11:p-0:s-0:s-12:a-442
  end: 60+367: i-2:a-0:a-0:a-21:h-11:i-0:m-4:m-10:p-0:s-0:s-12:a-367
So some progress as well - it's a steady move towards a reasonable uninstallability count (the last number being armel).