Although Airbnb has grown wildly successful in a short period of time, they are not standing still. The company just rolled out some powerful new brand messaging.
It is all about community and belonging (the Deep Metaphor of Connection) rather than about the nuts and bolts of renting rooms and serving as an alternative to hotels.
They also have an interesting new logo, which they hope will become a meaningful badge for the brand, much like the Nike Swoosh. And they have overhauled the Airbnb web experience, as discussed here.