Looking for documentation of R integration with IQ

My google-fu is on the fritz today. Anyone have links for documentation of R integration with IQ?

I'm trying to find any documentation on R integration with IQ (part of Advanced Analytics). It was added in 15.1 and there is plenty of news announcements and a couple sales presentations stating it is wonderful. Unfortunately, I haven't been able to find any technical documentation regarding it.

What we're looking for:

Manual / white papers stating how to set it up, what are the limitations, is the R code interpreted or compiled into byte code, example code and whether it is part of the base product or if it is an add-on. If it is an add-on, which license pack is it part of?