I found this nugget at mitbbs.com
http://www.mitbbs.com/article_t/EB23/32107949.html
My take on this is that the retrogression announced in the June 2014 VB for EB3-C went into effect immediately on the VB publication date.
I think that has happened because there are none to few visas left for EB3-C this year. A 6 year retrogression is as good as being made Unavailable.
Similarly, CO said retrogression for EB2-I to the December 2013 VB Cut Off Dates took place on November 20, 2013 due to excessive visa use.