I think it may be connected with the fact, that SDK for using new nodes by 3rd party renderers isn't ready yet, and ProRender is 3rd party renderer, no matter how deep it integrated in cinema.
I agree with @hvanderwegen, it looks wrong and nodes should be in every renderer from beginning. But I will choose good implementation, not the fast and buggy one. Yet, waiting another year for that is sad, hope MAXON can add this in mid cycle update, but don't hold my breath.
I love this update, not because I do fancy mograph stuff, but because I see where is cinema going in transition to new core and what level of features I can expect in the future.
Also I agree with many others that MAXON should be a little bit more open about their plans. I'm sure they watching and listening what people say about new release all over the internet, and, maybe, they will make some statement at siggraph to clarify all questions and doubts of community. We don't ask for complete roadmap with planed features and dates, though it would be nice, but rather acknowledgment of current situation, understanding of community needs and affirmation that it all in the work.