I think getting this model would probably be a mistake as I think the next one will get a chassis redesign, 4K panel and USB Type-C. I also think it'll receive Skylake although that to me isn't important.
My main complaint with the Retinas for the past three years has been the screen. Asus now offer a 15.4" laptop for $1,500 with a 4K IPS panel, 512GB PCIe SSD, 16GB of RAM and a GTX 960m. And of course it comes with 802.11ac and Bluetooth 4.0.
It looks good, it has the hardware features I want but it doesn't have OS X. It's frustrating for me that Apple makes my favorite operating system but has such a limited range of hardware.
Had it received a 4K panel I'd have already ordered one. I need that 1920x1200 desktop and I don't want to use scaling, things look blurry scaled.