I see some others having wifi issues with the new 2016 Macbook Pro so here's my experience to add to the dialogue. First, I have two of the new 2016 models. A stock 13" with TB (purchased at the Apple store) and a customized 15" (ordered online) with TB.
The 13" model began exhibiting wifi issues almost immediately but it was intermittant. What happens is you're browsing the web, watching a YouTube video, etc., and out of nowhere wifi stops working. Now the crazy thing is if you go to system preferences\network it shows the wifi as connected (green) as if all is good. As well, if the wifi analyzer (hold down option key when clicking the wifi icon in top right then select Open Wireless Diagnostics) was on monitoring the connection and the connection stopped working wifi analyzer would not detect a problem. So the connection stops working but the troubleshooting tools think it's fine.
Now, you might say maybe the connection is there but really slow due to low signal. Well, perhaps that's true but both browsers (both Chrome & Safari) would time out and say "No Connection" before showing any loading of a web page. You might also ask the obvious question, was your wifi router working? Yes, I have 20+ devices using wifi and everything else would be working including the new 15" 2016 MBP w/TB. It was just the 13" that would stop working. The only thing that would fix it would be turning wifi off and then on again. See link to video :
)
So what was causing it? Well, at first I thought it was USB C like others have shared. But I did more troubleshooting and found scenarios where it was not USB C. For example, I had it fail while not using any USB C devices or peripherals, I had it fail while using a 5Ghz wifi network (I believe USB only interferes with 2.4Ghz wifi and not 5Ghz). And the failure was always the same. Wifi just stopped working with no ability to get on my private network as well as get on the web using Safari or Chrome.
In the end, I came to the conclusion there was clearly a hardware problem with the wifi adapter so I took the 13" back in and exchanged it for another. Which by the way, in my opinion Apple customer service is amazing.
Swapping it out with the return period was such a painless process considering how much this thing costs. No asking me a bunch of questions, no making me wait in a long line, no booting it up to check to make sure it was doing what I said or giving me the run around about how it could have been my wifi router causing the problem. I simply explained what it was doing and the guy said "okay, let me get a replacement for you" and out I walked in about 15 minutes It was AWESOME!!!!
So I know we (me included) sometimes complain about the higher cost of Apple products and sure I'd love the price to be lower, but let's face it the service and resale value are in my opinion worth every penny. Oh and quality/longevity are also incredible. This 13" MBP w/TB is replacing an 8 year old iMAC. Think about that. We used that iMac for 8 years and with an SSD in it the last 4 years it still was a great machine.
Now to the good news, the replacement so far after a week has had no problems. Wifi has been rock solid. Hopefully they'll fix whatever it is causing this. I personally think these new laptops are great.
Thanks all,
Steven