Siri sees a major refresh for iOS 11 with two brand new voices. This means you get a more natural sounding voice when you interact with Siri and there are a number of upgrades to what the assistant can do as well.
There are new male and female voices that you can choose. In addition to paying people with Apple Pay using Siri, you can also translate into another language. Siri can translate English into Chinese, French, German, Italian or Spanish using your voice. You see the written translation and Siri speaks the translation as well.
Siri also delivers more personalized results in Safari, News, Mail, Messages and more. Siri will learn from what you type in Safari and browse in Safari and can suggest those in Messages, Mail and other places on the iPhone. AirPlay 2 includes Siri support for choosing a new speaker to control your music across multiple rooms.