In addition to the 80+ new countries added to the app, there is also new support for more than 30 languages, so users around the world can get into the Field Trip fun. And, if you are traveling internationally, the update also brings translations for the information cards, so you can translate any cards into your native language. There's no word on it, but it looks like the app is taking advantage of the new developer translation tools that Google announced yesterday.
Lastly, the app makes it easier to find places nearby by aggregating place cards when you zoom out on the map view.
If you want to try out the app, it is available for free in the Google Play Store. No word on when this update may be coming to iOS.