And also on the subject of false rumours, many fans have been waiting eagerly for the DVD of Chamber of Secrets to be released.
They want to go through it frame by frame to check out speculation that JK Rowling had a tiny part as a witch in Knockturn Alley.
Well, we'll save you the trouble!
People at the studio tell us there's no truth in that rumour either.
But, don't worry, with the start of filming on the next movie being so close, more firm casting info should be coming our way soon.
So make sure you keep checking back for all the latest Potter news you can trust!
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David Heyman: Full interview
Swap goss on the Potter actors!
