According to the Wikipedia details associated with IBM Rational ClearQuest the "latest" version of this product was released in October 2011.
Would I be right in assuming that this is no longer actively being actively developed by IBM and that their alternative Rational Team Concert is their preferred offering in this space?
ClearCase like ClearQuest are still "maintained", but without any new outstanding feature.
RTC is more an aggregation of three tools:
So RTC isn't just a replacement to ClearQuest, but a way to ensure a traceability durng the application development life cycle: