I mentioned Pegasus on September 28th of 2010. It was at version 2.0 at that time.
It is at version 2.0 today.
With all the development, including in graph projects, over the last eighteen months, I expect to be reading about new capabilities and features.
There have been new publications, Spectral Analysis for Billion-Scale Graphs: Discoveries and Implementation, but it isn’t clear to what degree those have been incorporated into Pegasus.