According to the FAQ on Apple’s website, Siri – iPhone 4S’ personal assistant feature can currently understand and speak in English (United States, United Kingdom, Australia), French (France), German (Germany).
However, folks at 9 to 5 Mac noticed that when you ask Siri what languages it supports. It claims it also knows Japanese and advises you to change the language it is using by going to Siri Settings.
But as you can see in the screenshot below, Japanese is not available as an option in Siri settings.
According to a rumor last week, Apple may add support for Japanese, Chinese and even Russian to Siri next month. So this suggests that the rumor may indeed turn out to be true.
Apple has announced that it plans to add support for Japanese, Chinese, Korean, Italian, and Spanish to Siri in 2012.
[via 9 to 5 Mac]