Based on the court latest ruling on another case, it appears that the court will vacate PTAB's decision on Worlds' RPI due to PTAB's error on shifting burden of proof and in denying Worlds' discovery request on RPI issue. But the big unknown is will the court solve on the RPI issue directly by itself or will the court pass the case back to PTAB for further discovery?
I'm on the camp that the court will issue a vacate order without remanding for discovery.