i have to ask Renato,
but from what i would say fore & background is unlikely, these are AR specific things.
for the compositing tag i think there will be similar function in vray, not sure yet in which form they will be implemented.
sky is also a cinema specific thing, but is actually just a big sphere, so i think it can be supported or translated in a similar thing.
please be clear than a external renderengine is a system of its own. AR specific things can only be tranlated if there is really a one to one similarity in the external engine.
i am sure Renato will do his best to give us a great render engine for cinema. such a bridge is not a normal small plugin but a very complex and detailed thing to do. Renato does great success with this, but he has a huge "to do " list with such a project:-)
so please understand i cannot answer such details really now. if it is possible within reasonable effort it will be in.
cheers
stefan

