Google's Local Guides that are at least level 2 have received a mysterious email today:
Reaching level 2 as a Local Guide can be done in just a couple of days, by reviewing just some of the places you visit. Since learning about the program I signed up, and all it took to get to level 2 was to review the couple of restaurants and parks in my neighborhood and answer a couple of basic questions about them.
Travel features have been popping up in Google Now and in Maps for a while, and it was only a matter of time before Google set their sights on a travel app. All we can do now is wait and speculate, but one thing's for certain: watch out, TripAdvisor!