Google has released v5.0 of the Google Keyboard, and this is a big one. The UI gets lots of little changes. You can now enable borders for keys so it doesn't look like one plain surface. Google dropped the old Holo themes and the light and dark Material Design themes are the only ones available. Google moved the emoji button inside the special character menu. There is also a new numpad button there now, which shows the numbers arranged in a traditional layout but the old row of numbers is also available. There is also a one handed mode now, which shifts the keys to either side...
Source: http://www.gsmarena.com/google_keyboard_50_update_brings_lots_of_new_features-news-18059.php
