Apple's yearly developer conference should see iOS 8, OS X 10.10, and likely some hardware.
Apple Job Listing Suggests Siri Coming in 9 More Languages
The job listing, for Cloud Services Engineering Interns, asks for interns native or fluent in Arabic, Chinese, Danish, Dutch, Finnish, French, Korean, Norwegian, and Swedish to work on "delivering Siri in different parts of the world." Languages where Siri is currently unavailable on that list include Danish, Dutch, Finnish, Norwegian, and Swedish.
Siri is currently available in English (US, UK, Australia, Canada), Spanish (US, Spain, Mexico), Chinese (China-Mandarin, Hong Kong-Cantonese, Taiwan-Mandarin), French (France, Canada, Switzerland), German (Germany, Switzerland), Japanese (Japan), Italian (Italy, Switzerland), and Korean (Korea).