User blog comment:J Fan/Bruckheimer Talks PIRATES 5 mid-2014 update/@comment-1984959-20140722111039

The following is a report by Gloucestershire Echo online:
 * The next installment in the Pirates of the Caribbean movie franchise could have scenes filmed in Gloucester Docks, it has been reported.
 * Filming of Disney's blockbusting sequel could bring Hollywood stars Johnny Depp and Geoffrey Rush to the county.
 * Dredging work is taking place at The Docks, and it is rumoured this is being done ahead of five tall ships arriving next month.
 * Original link

As always, take this rumor with a grain of salt until any official sources clarifies this. Time will tell and, hopefully, that time is not far off.