Apple is known for its unexpected and cutting-edge developments, he said.
"You never can tell with Apple, that's the beauty of watching them, they come up with all kind of things you least expected."
Rumours are rife that the tech giant was working on an iPhone 5S with features including a fingerprint scanner instead of a lock code; that it will come in gold rather than the usual black or white; and that it will have a top-of-the-line chip that will allow it to run up to a third faster than its predecessor.
It is expected the new gadget will be sold with the technology giant's revamped mobile software, iOS 7.
Mr Brislen said New Zealand was usually in the first lot of countries to get new devices, though in small amounts that kept demand high.
The new system, which will automatically update apps installed on the device, can be downloaded on the iPhone 4 and later models, as well as on the tablets beginning with the iPad 2.
Apple has never waited longer than a year to update the iPhone, which has generated US$88 billion ($109 billion) in revenue during the past year, and typically rolls out its latest product at this time of year.
This year's refresh of the iPhone line may address the growing popularity of cheaper Android phones.
