Do you ever wonder, when you hear news like this, if maybe the studio leaked it on purpose? Like, maybe they realized that their movie sucked, at least compared to the budget they blew on it, so they figure they'll need an excuse to explain to their shareholders why their film won't make its money back. Leaking a copy of a bad film not only gives them a good excuse but also opens up the potential for lawsuits (which, if they can get one to stick against a deep-pocketed ISP, could be quite lucrative), potentially recouping all the money that their film wasted.
I mean, it's not terribly likely, and if their movie is actually good it becomes exceedingly less so, but without having seen the first two, I'm guessing that, as is common with third films in a series, this movie will not be a stellar example of its craft -- and given the credits list, I bet the cast didn't come cheap.