ZBrush 4R7 is the final iteration within the ZBrush 4 series before ZBrush 5.0 and is packed with major additions. In fact, 4R7 is one of the most extensive releases since ZBrush 4 came out.
With ZBrush 4R7, you will add another set of tools to your arsenal, expanding your artistic freedom and creativity. Major features in 4R7 include, Array Mesh, NanoMesh, ZModeler with QMesh, KeyShot for Zbrush and ZRemesher 2.0. They allow you to stay within ZBrush for more of your workflow, doing things that were either impractical or even outright impossible to accomplish before now.
The core of ZBrush is being reworked and 4R7 will be the first version of ZBrush that is released with optional 64-bit support. This will allow you to fully harness your machine’s power, not only allowing for higher polygon counts but also making it possible for you the artist to create more art in less time. Read more here.