They have released several more international balls with that core. Vivid Dream (NRG Pearl cover), Vivid RNP (R3X Pearl), and Lucid Vision (ERG Solid) but no hybrids unfortunately.
On a side note: I have a funny feeling that in the near future Storm will be coming out with a Premier line hybrid but I doubt it will be the MAD core. It will either be the G2+ core or something brand new (what I am hoping for). Its been a long time since they have had a premier hybrid (Virtual Energy-'09) so my gut tells me they have to have something in the works.