Current adoption: There are a number of Data Type Registry prototypes being actively tested today, including

Deep Carbon Observatory Data Portal
https://www.rd-alliance.org/sites/default/files/attachment/Zednik_RDA-P5_Adoption_DCO-v1.pdf

Materials Genome Initiative
https://www.rd-alliance.org/sites/default/files/attachment/Materials-Data-rda%20P5%20Adoption%20Day.pdf#overlay-
context=plenary-meetings/fifth-plenary/programme/adoption-day.html

International DOI Foundation (IDF) 
http://www.doi.org/topics/outreach_milan_nov14/13.CNRI_LANNOM_outreach.pdf

A number of other prototyping activities are underway, both inside and outside of government, but do not yet have any public presence. This would include, for example, EUDAT, but there isn’t anything to point to.