The main problem with that report is that it says that David Yates will be directing. Mr Yates denied that (nearly a month ago) and as well we all know Peter Jackson is now slated to direct. So ... it's hard to take a report seriously when they get such basic facts wrong.
Anyway I'm sure that McKellan is free to do other things while he's waiting. His situation is quite different to Del Toro, who was part of the production team and also one of the writers. McKellan is only required if (and when) the cameras start filming.
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