17th here. We already had previews on tuesday, and I'm working in a cinema, which means I got to see it for free...
Anyway, there
are mistakes you can already see in the trailer. For example, on the gravestone that's supposed to be Voldemort's father's, there is the name 'Tom Marvolo Riddle'. Well, if Tom Marvolo Riddle was dead and buried, there wouldn't be a point to the series, would it?