I am fine to wait on Skylake for this system, that said if I was to see a 512 in a retail outlet, I would likely just buy it. Skyline at this level does not offer too much improvement, mostly power consumption and bump on CPU/GPU performance. I just need to validate the build quality & performance which I doubt will be an issue.
I was looking at the Surface Book, however wanted a smaller footprint, looked at the Surface Pro 4, which I do like, equally I would prefer a more powerful system. The Canvas has pretty much all I want; DP, HDMI, 2 x USB 3.0 and Ethernet which is a bonus, the display is fabulous and computationally as strong a 15" rMBP. The lack of backlight for the keyboard is a small minus, the only other box the Canvas does not check is a dedicated dock, and that I can live with.
This is really the product I would love to see Apple produce, however the target audience for Apple has changed, can you imagine a 12" MacBook with this specification! I doubt many of us would be concerned about it being thicker. As it stands Apple wants obviously to sell more volume, so we can expect more of the likes of the 4K iMac, not cutting edge portables.
I like their reviews, as they not not biased and there is enough detail for an initial feel of the product.
Q-6