iOS 8 will feature support for system-wide, third-party keyboards. It will now be possible to install keyboards like SwiftKey, Fleksy, and more as your default option throughout iOS.
The demo used Swype, a keyboard that allows you to swipe your finger over the keyboard rather than lifting and tapping each letter. Keyboards will be a part a part of iOS 8's new extensibility support. They will also be sandboxed, and can only be opened up for things like network access with the permission of the user.