Photos and details under the cut - the BBC HAVE now actually released a photo but it's under the cut anyway.
Only click the "read more" if you really, really want to...
Jemma Redgrave (Kate Stewart) and Ingrid Oliver (Osgood) join Peter Capaldi, a group of UNIT soldiers and a bunch of Cybermen who are filming in Cardiff City Centre this morning:
photo courtesy of alicia_ms
Photo by the BBC
Photo by CarbonLife4rm
photo courtesy of benlyingtous