Local Guide = map contributor (had to look that up)
https://www.google.com/local/guides/
http://www.droid-life.com/2016/04/21/google-inviting-people-test-new-travel-app/
scanning reddit comments, it appears to be international
https://www.reddit.com/r/Android/comments/4fu313/google_is_inviting_people_to_test_a_new_travel/
Oh shit.
They've started using their Android user base to thicken the data as well. I've had a couple of notifications lately asking me if I'll tell them more about places that I have visited. They seem obsessed with knowing whether places are "popular with the college crowd".
I've got a Nexus phone, and after the April update I started getting overt notifications from Google Maps to help them add information like this for local venues too.
Google is reportedly building an awesome all-in-one travel app called Trips
http://thenextweb.com/google/2016/04/28/google-may-testing-new-app/
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screenshots
http://androidandme.com/2016/04/applications/google-trips-app-screenshots-shown-off/