If Jackson Racing (who, amazingly enough, produces the supercharger kits) can't tell you when
their kit is going to be released, I'd be willing to wager a good deal that nobody here will know either.
Either way, it'll be a bigger ***** of an install than the 5th Gens. Have fun.
The two main S/C kit producers are JR and Vortech. The former may produce one--we've all seen the prototypes (for the H23's) all over the place. The latter--well, once they finish their GSR kit, and everything else, they may want to consider a kit for the 4th gens in a couple decades.