About an hour's reading has lead me to this, the Renderbox software has integrated mentalray 64-bit. It provides full integration to Maya and Max via plugins. They provide three materials (shiny, glass, mirror) which can be used in lieu of and alongside the materials available in each program. Here's an excerpt from an article at Vizdepot...
"Brian Tyler, CEO of ARTVPS, said:
"With 64-bit architectures now driving 3D applications, we are seeing model and scene complexity growing and increasing demand for ever higher quality images and faster performance. It is great to be working with mental images, whose products are an industry standard. As a result of our alliance, ARTVPS' next generation RenderDrives will also support the mental ray 64-bit renderer together with our RenderPipe material library."
So it seems that if you're using MR4Maya or MR4Max, you're fine and also get 3 new optimised materials and your cameras/ area lights and IBL.
Article at highend3D...
http://www.highend3d.com/news/highen...solut-109.html
I suppose if you're a mr user, they're kind of looking good now, especially as the price has come down. 28 cores @ 64-bit, install and start rendering, software and licences inlcuded. Yep, sounds like a really good deal!