Just wanted to give a summary of my experience so far:
My router: Netgear WNDR3700v2 running the latest official stock firmware
this router has several devices wirelessly connected to it including an older Macbook Pro (late 2007), two iPhone 5s, a couple of android tablets, an xbox, and a windows HTPC all working flawlessly throughout this ordeal.
Summary:
I ordered a 13" i5/8gb/256gb model from the website the same day they were released at the WWDC. The device that came immediately had wifi issues. It would connect to my home wifi and would work for anywhere from 1 minute to 15 minutes and then it would lose it's connection. After dropping, the machine would no longer be able to see ANY wifi networks until it was rebooted or it came back up from sleep mode. This happened both on the 2.4Ghz and 5Ghz networks.
Turning wifi on and off via software had no effect after the wifi dropped. If i turned it off and on prior to the drop, then it would function correctly until it dropped. I took this unit back to the apple store and it exhibited the same behavior on their wifi network. It did seem to take longer to manifest though. The genius felt it was a software issue and not hardware related. I don't necessairly agree with his diagnosis but either way the laptop was exchanged. I needed a working unit for a trip later that week and didn't have time to order another one from the online store.
The new unit I came home with was a 13" i5/4gb/256gb model and that machine worked perfectly on my home wifi. It had no issues whatsover and the wifi never dropped. It also worked great on the hotel wifi at the resort I stayed at.
I ended up returning the 4gb unit and placed a new order for one with 8gb of memory. The new CTO unit is being "processed" and I assume it will arrive sometime later this week. Hopefully it will not be a dud.