Hmm, I don't see a point in getting something like Octane/Vray inside of 3DCoat. Is it just for better quick renders and material preview? I have my doubts the developers are integrating and allowing any further shader network manipulation similar to other DCC apps and renderer plugins. Most concept artists, I imagine, are comfortable already with pushing models and texture maps out of 3DCoat into other rendering dedicated software. This will just lead more requests in users desiring a more general and broader 3D package with 3DCoat. Can the developers really support that change in direction? What kind of refactoring is required on that? There's a lot more to be considered.
I highly doubt it would be 'free', and it would be something Pilgway would have to consider into their licensing pricing. I also don't expect out of the popular rendering software companies to be supporting a 3DCoat implementation in the long run - especially a company like Chaos Group, so I doubt it's them as an option.
Maybe if I understood the intention of this kind of implementation more than as a general question this would make more sense for me.