One of the key value propositions that Microsoft has been trying to push with its digital assistant Cortana is that it's available on all of your devices. From a Harman Kardon Invoke speaker, to your PC, to your phone, to your gaming console, it's supposed to be wherever you are. Unfortunately, the iOS app was never optimized for Apple's iPads, until today.
Version 2.6.8 adds the feature with an "exclusive layout and interface for your iPad". The app also now promises to launch 20% faster than it did previously, for a "lightning-fast experience".
With Cortana, you can ask questions like, "What's the weather going to be like later today", or you can find out what's on your calendar, and so on. More importantly though, you can receive notifications that you set on other devices. For example, if you set a reminder on your phone, you'll receive that notification on whichever device you're using, whether it's your Xbox One, your Windows 10 PC, or your iPad.
The App Store won't automatically install Cortana on your iPad if you've already got it on your phone, but it will automatically update it if you installed the iPhone app on the device. You can find Cortana on the App Store here.