This is from the google play page
"WHAT'S NEW

We've been working all summer to prepare some new surprises for you - keep your eyes peeled in the next few weeks for new features and rewards!
This update has:
- new functionality to support in-game offers and giveaways
- optimizations to make the game run smoother for some players who experience freezing or hanging during the game's loading screen
- black screen ad fix
- upgraded back-end
- a couple other bug fixes
Thanks for playing!"

So basically the new update will improve ads. yay.