A leaked user manual for the upcoming iPad Air reveals a couple of features and bits about the design. The manual itself is in Spanish and comes from the Eurasian Economic Commission as part of the registration process.
Judging by some of the images from the user manual, we can say that the new iPad Air will feel and look a lot like the 11-inch iPad Pro from 2018 with super-thin bezels but instead of Face ID, the device will adopt Touch ID.
The fingerprint reader is said to be integrated into the power button on the right side, making this the first side-mounted Touch ID on an Apple device. It goes in line with previous rumors about Apple readying a device with a fingerprint reader integrated into the power button.
Additionally, the images reveal that the back will have contact pins which leads us to believe that it will be compatible with the Magic Keyboard for iPad Pros. It's not too far-fetched to assume that the Apple Pencil will be supported as well.
Source (in CHinese)