Not sure... it all goes off demand. Right now, the BCC world is buzzing... Everyone is working to get out new designs, and everyone is trying to one up the other.
With all of them moving to eVod/Protank had designs, it would just be a matter of someone designing a dual coil replacement head... But looking at the size of that coil, it might be tricky to make one small enough to fit in that tiny little chamber.