A series of text strings discovered within iOS 8.1.2, and included on software versions dating back to at least iOS 8.1, suggest that Siri could soon receive expanded language support on iPhone and iPad. The localized strings provide translated references to how Siri would display things like settings toggles, restaurants and reservations, and sports information in Czech, Slovak, and Polish.
Apple has been hiring engineers over the past few years in an effort to expand the localization of Siri on iPhone and iPad, seeking to add support for Russian, Brazilian Portuguese, Thai, Arabic, Danish, Dutch, Finnish, Norwegian and Swedish. Apple also added 24 new languages to Dictation in iOS 8 and OS X Yosemite for speech-to-text, including Czech, Slovak and Polish.
Apple has several updates planned for iOS in 2015, so it is possible that Siri could gain support for these additional languages at some point this year. Earlier today, Apple seeded iOS 8.2 beta 4 to developers for testing with Bluetooth support for the Apple Watch and evidence that a standalone Apple Watch app is on the horizon.