BSD,
the term "Identification terminated" replaced "Radar services terminated" with the roll out of ADS-B. "Identification terminated" also refers to ADS-B equipped aircraft leaving ADS-B coverage, ie. it is a blanket term used when an aircraft leaves surveillance coverage.
But, even if an ADS-B aircraft leaves radar coverage but remains in ADS-B coverage (ie. the aircraft is still identified), for the time being it will be subject to procedural separation standards (ie 30 RNAV longitudinal).