I noticed on the blog that this could be potentially node based. I hope this is not true, the layer based approach in the new vray vfb is very powerful and a simple approach. Either that or have both options (layer based for normal users, nodes for super users for example)? Maybe a poll on this would be a good idea because I'm sure its just bias on my side. My thinking is that nodes are great for creating pipelines but artists are also comfortable with layer based systems because of the intuitive nature of working with photoshop and blend modes etc. I have always liked corona for its simple first philosophy.
My 2 cents.