More information at WETA Workshop on Facebook:
Right now only available at San Diego Comic-Con, WETA Cave.
Will be available for wider purchase, without shield, October 2012
By the way, if you have Cable TV (I only know the US, but check out your own TV providers) Spike TV and the G4 channels will have live coverage of the San Diego Comic-Con.(thanks to Ricrar for the heads up)
Looking forward to The Hobbit and Game of Thrones and TORn panels!