We've made a similar decision to wait till the first generation is out. Dealers can't even get the info on carplay from US or EU headquarters whether it will be on car x or y ... which production starts two months from now for the '15 model.
Given that it is a bit of a game changer and if you hold onto your car from new till it is not economical to repair any more, then, I figure it is better to wait.
I'm also still curious what will happen when little CarPlay Protocol/Firmware/OS 1.0 goes not only from 1.0 to 1.1 etc but to 2.0 or 3.0. Is the head unit user upgradeable and future proof from the get-go? ... or?