At the end of the final episode, an anime movie of Mouretsu Pirates
Moretsu Pirates official website
("See you at the theater." by Director Sato Tatsuo)
Source: Screenshot of the announcement
Update July 3rd
According to an interview with Director Sato Tatsuo, the movie will be a continuation of the final episode of the TV series.
Source: Excite News
Mouretsu Pirates Movie