Well, the current 15 inch MBP is running 2 years old Haswell processors, so it's simply a bad buy when Skylake MBPs are coming out in a few months.

Additionally, Skylake brings DDR4 memory, Thunderbolt 3.0 (Thunderbolt over USB), and better performance/battery life. There's also possible wireless charging support, and the Skylake integrated GPU possibly has double the speed of the Haswell Iris chips.

- USB Type-C

- The ability to run external 5K monitors.

Since I usually keep a laptop for at least four years, it would be unwise for me to now buy a laptop that can't do both of those technologies which I really want to have.

I have a Haswell MBP. I don't remember a time when I had to plug a USB device into it. The only device I can think of is a flash drive, but the last time I used one was more than 2 years ago.

Which USB devices do you use with your laptop?

Regarding 5k displays, currently I'm still not ready to buy even a 4k version, mostly because I'm waiting for higher frequencies (via G-Sync or FreeSync, both of which require a discrete card, and it's not at all clear if those will be supported in the next MBP). 5k monitors currently cost 4 times as much as 4k. Really hard to justify buying one anytime soon.

If Apple does not release Skylake MBP in October, I would recommend buying the current one, rather than suffering the horrible resolution of MBA for another 6 months.

32gb of ram, 5k monitors, Thunderbolt/USB 3, etc etc etc...