Oh, "shadowcatcher" (if it's applied the way I believe it has been) is going to be one of my first reasons for upgrading to P6. If you do any kind of compositing work, or perhaps wish to render shadows as a seperate pass for more post-processing control, which is useful for both stills and video, then I think you'll enjoy having that option. I'm praying for multiple undo, network or distributed rendering, and at least some G-Buffer output control. So far, at least, I haven't heard anything on that stuff. Got my fingers crossed.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.