The axle shafts are not the same as anything currently on the market.

They are D44, but with a 32 spline count, vs. the 30 and 35 spliners out there. Also, they did something with the carrier inside (not exactly sure what, haven't been that far into it yet) so as to not facilitate easy installation of any current lockers and such.

Not sure on the last part, just conjecture from a couple of techs. The spline count is from a Titan, but we're told it's the same as the Frontier and Xterra. The Titan and Armada's are also running the D44 setups.