The dullest, most vital trend in travel mobile apps: local curation
In a broad trend, travel players like Gogobot are moving aggressively into the “local” space in order to capture the attention of the mobile traveler.
This trend partly explains why Priceline bought OpenTable, and why TripAdvisor bought La Fourchette. Users book restaurants much more frequently than they book travel.
It's also partly why Foursquare relaunched itself as a Yelp-esque local discovery app. Local events are more relevant and front-of-mind than occasional out-of-town trips.
Unlike the web, where you can rely on search for traffic, on mobile you need to build a regular engagement and usage patterns.