I'll give a full answer shortly but 2 quick questions.

Budget?

When do you want to start your build?

The Intel Z200 Series chipset boards should be showing up sometime soon along with the Intel 7000 Series processors.

Also with the Samsung M.2, make sure you get the NVMe version for your build with a board that supports it properly.

If you can, I'd suggest waiting for the new Hardware Launch before making purchases.

Basing my answer off of current tech so it's not going to be 100% accurate until official benchmarks from sites not owned by someone at AMD come out I'd suggest the following.

Go with the Asus Maximus VIII Hero "I have the VI Hero running an i7-4790k"

Note:  If there's a motherboard that can encapsulate & cool the M.2 2280 SSD below you'll likely want that one instead

Unless you're going to do some heavy Virtual Machine work or A/V encoding work, save the cash & drop from an i7 to an i5 if you run into the budget wall -- This will save you around $100-$140 if prices are similar to the 6000 line

A Closed loop cooling unit for your CPU.  My Corsair H90 is working like a charm - However I did put 2 high airflow quiet fans on it "Corsair 140mm if I remember right" -- This will be roughly 100-160 depending on the unit & fans you get which depend on the space avail in your case

If your copy of Windows is an OEM version you may need to replace it -- 7/8.1/10 Go with the Pro version for the higher amount of ram support.

Balance the costs of these 3 below with the remainder of your budget

Corsair Dominator Platinum DDR4 - Buy in Pairs, as fast as the board supports, suggesting no less than 16GB max of 64GB on the new boards I believe

Samsung 960 Pro "Ranges from 256GB to 2TB"

High airflow low noise adjustable RPM fans for your case

Honestly if you have enough after the above and desire VR experience, look at picking up a GTX 1070

Other odds & ends for the build

Arctic Silver V if you don't have a tube laying around.

Custom cable kit for SATA3 Cables

Custom Cable kit for power if your power supply is modular

Power bar to move the Video card power cords from the top of the card to the bottom by the end to reduce cable clutter

Poke me closer to the build & I'll fill in part numbers when avail

Thank you both for the replies!

TechReports always has some good takes.

http://techreport.com/review/30606/system-guide-current

This is not the case anymore, as the 6700K is 500Mhz faster than the 6600K even without the other advantages..  The i5's have a smaller amount of memory to work with as well, they're essentially hamstrung in large work loads.  It's true that in typical day to day operations of the average gamer, your 100Mhz slower i5 is only a few percent slower than the i7 you could have bought, but as soon as you do any heavy lifting, like video encoding, or compiling, that extra 2MB of ram can make a substantial difference.  Alas, they're not 100Mhz apart, so that i7 is going to be 15% faster on the level simply because it's 15% faster.  They also lack hyper-threading, which will be increasingly powerful for gaming going forward, as the switch to multi-threaded, 64-bit gaming is well under way.  Ashes is simply the first of a great many to come that will benefit substantially from the capability.

When I bought my 2500K instead of a 2600K, this was gold standard advice.  I actually got better performance in some games because of poor support for hyper-threading outweighing the performance loss from being 100Mhz slower.

 Be aware that the 6800K is as much slower than a 6700K as it is faster than my 2500K from 5 years ago for it's single threaded performance.

Not a problem going forwards, but it will impact games like Sins, which is where a few of us are posting from.

Edit: I would wait for the AMD release even if you wouldn't buy an AMD if they were twice as fast.  Regardless of whether you'd ever want one, there are good odds of price cuts following their arrival.

It all depends on what you're playing, the current trend makes the power of your processor less relevant, not more so.  A hyper-threaded quad is already more horsepower than you should ever need for a video game in the next several years.  If you've stopped playing anything like Sins, sure, it's not really a concern.  If you're still burning a few hours a week on it and you'd really like to play a huge game without it being a slideshow, you want as much horsepower as you can get, and 15% faster is quite a bit faster.  Expectations of a Sins 2 down the road that may or may not appear and would likely be at least a year or two out even if it's in the works now won't really help with his immediate upgrade.  If single core performance is going to be a big issue for him, he needs to know this stuff.  Those huge map games turn into an absolute slideshow on my 2500K, even when I overclocked it to 4.2Ghz.  That's faster than a stock 6800K.  The computer that can run Sins in all it's overloaded glory just doesn't exist.