User blog comment:Mr. Joshamee Gibbs/Pirates 5's New Release Date Announced !/@comment-1140008-20140723202348/@comment-1984959-20140723224627

It could be a simple mistake, but it could not be a mistake. But thinking about it logically...
 * 1) Is Dead Men Tell No Tales at least a working title? Yes, because of past reports.
 * 2) Will it stay as the title if P5 makes it to the big screen. Maybe, maybe not.

Perfectly reasonable to suggest either or, but one real fact should not be denied: as with release dates, titles can and will change if those involved feel they need to. Best example of the title staying is Dead Man's Chest and On Stranger Tides (but one can say it's because of Tim Powers' novel). But the examples that do prompt people to be cautious is...
 * The Curse of the Black Pearl - supposedly titled mere months before it was released
 * At World's End - which had a very-real draft titled Calypso's Fury, which Terry Rossio notes the title "was never in serious contention, simply a working title, until marketing deadlines forced the eventual title to be determined."

Last thing to note, whether they keep it or have decided on a different title will be answered over time.