Here is a link to the invitation:
http://www.jw-archive.org/2011/04/district-convention-invitation-2011.html
Some of the Facebook comments on the left are entertaining.
This seems to represent a change of Daniel's interpretation. In the Daniel book I recall the feet being the politically divided world in the 'time of the end' and the ankles were the Anglo-American power. Now the feet are the the UK & US...