According to Tech Crunch:
Snapchat is adding a new way to use its app that brings its popular filters beyond faces. The new ‘World Lenses’ add augmented reality elements to any scene you can capture with your camera, placing 3D objects you can actually walk around with your smartphone’s camera, which is actually a lot closer to what we used to mean when we said “augmented reality” in its earlier days.
Read more here.
The new lenses should be live in the app today, so have fun experimenting!