Well, the v3 roadmap will be officially announced next week at Siggraph, so for today is still not possible to announce anything yet.
But in this article from FXGuide describing the rendering panorama today, there are a few of sneak peaks about what is coming in the next version of Maxwell:
http://www.fxguide.com/featured/the-sta ... ing-part-2
Interesting to read the confirmation that the whole industry is today moving towards the physically correct approach of Maxwell.
More information about v3, next week at Siggraph (LA)...