I just saw on collinwood.net's
DS News Page that Bella Heathcote tweeted on April 25th that she had two weeks left before going to London, which I suppose would put her in London on May 9th, so apparently she's not filming yet. She also tweeted on the 26th: "I am counting down my days till London very excited Tim Burton again some one please pinch me".
Also, checking out her other tweets I discovered that the dark haired Victoria purists should be happy because it looks like Bella has dark hair again. Check out this photo she posted on the 26th:
Liam and Chris Hemsworth. All across fandom I can hear a sigh of relief that Victoria won't be blonde again.
She might be a waitress instead of a governess - but she won't be blonde.