I think the reason is: Started filming with no finished script
Which is worrying me as well. Starting to film the third film without a finished script? What if it needed another draft or something?
Might be wrong- but what other film jumped the gun this far in advance (shooting with no finished script)? Personally has me worried-
I don't think any of the third installments mentioned, even those filmed back to back, filmed without a finished script- and it probably just doesn't mean script changes made in dialouge and such on the day of filming (because, this is typical in Hollywood), but actually a not finished script.... for me, that's enough to worry.
If you have more details on the phrasing of: "Started filming without a finished script.": actually means, please share what you know.....
As a Pirates fan, last thing I want is for the third film to be rushed- which sounds like "started filming without a finished script" sounds like. Weren't ready- but Disney was looking for a 'quick buck' which usually amounts to X3 type movies- not enough time= not great 3rd movie. Hopefully I'm wrong.... if you know more about this- please share ASAP.