Today we will migrate to leaflet 0.6, so cartodb.js located at the default location (*) will include it.
If you have developed an application with cartodb.js using Leaflet you should check if your application is compatible with leaflet 0.6 (likely it is).if you find that your visualization is having issues after this update, use the cartodb.js available here 3.1.14 (located at http://libs.cartocdn.com/cartodb.js/v3/3.1.14/cartodb.js ) which includes leaflet 0.5
We are not going to maintain two cartodb.js versions so from today only leaflet 0.6 will be supported. That means that if we add new functionality to cartodb.js you will not be able to use it if you application is attached to cartodb.js 3.1.14
If you have any question let us know: