The current release, OpenFOAM-v1606+, was released on 30/06/2016. It includes improvements in many aspects of the code, including new boundary conditions, many extensions to snappyHexMesh, new solvers, significant parallel performance improvements, new and updated documentation, and code from third-parties. For more details, see here.
Download instructions for Linux, Mac OS X and Windows platforms can be found here.
Information relating to previous releases can be found here