I was told (at the NYIAS) that the mysky would NOT be available in the US on 2015 models due to leaks in the European models. They should start producing the 2016's in Oct/Nov for availability around Jan. The guy went so far as to say "that's why all the ones here have it, we can't sell them".
Not saying this guy was with Jeep or if he was just some local guy with a manual to talk to people at the show, but that's what he said when I asked him.
Also, my local dealership said custom orders are a max of 4-6 weeks (which sounded too good to be true) and that the mysky option wasn't even in the ordering tool they had and the leather option was "unavailable with an unknown ETA for placing orders" but others have said they've gotten Limiteds with leather already.