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.
One-handed mode (right or left justified)
Adjustable Keyboard Height
Toggle to show borders around keys
Toggle to allow for long-press to access symbols
New gestures: delete words and cursor control
New numpad/emoji button locations around the spacebar
Opt-in to share keyboard snippets with Google to improve Google Keyboard for everyone
All Holo themes have been removed
New first-time user set-up screen
Removed dynamic floating preview toggle
Toggle to allow for insertion of a period + space by the double tapping space-bar