They've been filming at Castell Coch - and there's a terrific set report here from Aimee.
Obviously, I'll put the photos from http://healthytowers.tumblr.com/ under the cut:
All photos copyright http://healthytowers.tumblr.com/
Personally, I think they're gorgeous. A much more streamline "armour" with a more Classic feel to the head - also very glad to see they've got rid of that awful Cybus "C" on the chestplate.