I don't know if they have ever sold it on the market, it's written that was intended like an experimental prototype. I've also found on Funboard, italian windsurf magazine, a full page new about a smaller and even nicer Supercat, but no more info around and not a single word on Starboard website.
Pheraphs they could ask you to be the Supercat promoter....
BTW I think that the Serenity Cat is something like a social board, intended for clubs and school, and as a serenity sportech alone is around 14 kg, the Serenity Catamaran sounds like 14+14+10? kg for the bridge, so not the lightest board for you (me too). The supercat for the few things I've read sould be lighter but does really exist in Starboard production?