Well, one good thing to point is that Pd-L2ork (and its Purr Data branch) started as a fork from Extended (from 0.42-5 may I guess?). So it's not like it died for nothing and, in a sense, Purr Data still keeps it going.
Spiritual successor. :)
It is also a technical successor. Like Pd-l2ork it builds on and extends the usability improvements Hans and others put into Extended. -Jonathan