I would either wait till someone with a Rubi swaps their t-case for an atlas or stak and then swap there's in. Either that or save you money and buy your own atlas or stak.........A 4 to 1 kit for the JK is probably going to cost 1,000+ Ive seen atlas 2 speeds for sale for $2000 brand new. If save up for that, then your not stuck with the stock weak case.

 

Yup, here those are.
http://www.teraflex.biz/pages/jeepbu...dID=95&subID=6
I would be surprised if gearsets for the JK aren't made available soon as well. I did a TJ gearset swap and it was super easy. The Tera kit costs around 1000 or so IIRC.