Android released a new keyboard with the new Android, Android L, but only developers are able to install it for testing purposes and it will be released soon. Follow these steps to install the awesome keyboard with the swipe feature and emojis.
Go to Settings, Security .. enable “Unknown Sources”
Open the installed keyboard app and follow the steps to configure your keyboard
Have fun 😀
Source: Shen Ye. Android L Keyboard version 3.1.20009