Apart from GIF's support, the new Keyboard also includes-
- New Emojis.
- Emoji button to the left of space bar with an option to remove in settings.
- Ability to set emojis to show up on symbols page Emojis on symbols key.
- New secondary symbols key button.
For now, the use of GIF's from Google keyboard is limited to Messenger only.
Comment below if you are enjoying and using this new feature of Google Keyboard.