So this is apparently called "Ponyo on the Cliff by the Sea" and looks adorably cute - as you'd expect with a Miyazaki film.
Wikipedia informs me that:
The story revolves around a five-year old boy, Sosuke, and the Princess goldfish, Ponyo, who wants to become human. Studio Ghibli President Toshio Suzuki noted that "70 to 80% of the film takes place at sea. It will be a director’s challenge on how they will express the sea and its waves with freehand drawing." The film does not contain any computer generated imagery, or CGI, in contrast to Miyazaki's other recent work.
Apparently it did really well in Japan when it was released earlier this year - I don't know if it'll be in New Zealand cinemas... Spirited Away did super well, so it wouldn't surprise me if it did find its way onto our silver screens, even if that happens through film festivals instead of mainstream cinema releases.
To find out more about Hayao Miyazaki (if you're unfamiliar with his work and want to know more), check out, wikipedia, or here.