Lena Headey has cancelled Berlin comic con but they still promoting her on the website and forums. It would be criminal to think they are still selling tickets on the basis that people still think she's attending and not telling the public she has cancelled, I for one will now wait.
I received an email from the German comic con telling me she had cancelled as I tried to order two signatures via the send in service, You can no longer order photo opportunities with her now so it seems final to me.