EB2 NIW I140 approved. It took 1 yr & 2 weeks for I 824 Approval. (TSC) . PD was current UNTIL last week ( April 2013 ). 60 days have passed. Was waiting for NVC case number. Am I eligible to take any action now?

Not much you can do, other than reaching out to NVC, if your visa number has retrogressed you have to wait for it to be current again. The next step if your docs are complete at NVC is for the consulate to schedule your immigrant interview.