WWDC 2017 keynote, where Apple explained that the updated version of its digital personal assistant will be arriving on Apple products later this year when iOS 11 rolls out.
According to Apple, the Siri update arriving later on in 2017 will bring a new language Translation feature in beta, one that will be able to translate between a few major languages, such as from English to Chinese and English to Spanish. It appears the early beta launch of the feature will only support translating from English to Spanish/Chinese/German/Italian/French.
Siri will be getting on-device learning capabilities, enabling the personal assistant to be better able to predict the things you want based on how you use the app. This improved prediction ability will be available across all your Apple devices with Siri, as well, for a seamless experience.