Here you have it, a surprise image that has Promethium Pipes in it. While I dont know out of what release its out of, I am going to assume right now that it is a leaked image. Of course with the limited edition Void Shield Generator, I truly hope this means that entire kit with both Relay Pipes and a Void Shield Generator is in the works. Otherwise, this is a big opportunity missed.
Here is a link to the leaked image on the Bols Lounge
http://www.lounge.belloflostsouls.net/showthread.php?43136-Prometium-relay-pipes