Uno Wifi Rev2 - I'm wondering what's up with that too. It was supposed to come out in July IIRC. I suspect the delay is with reconciling the Arduino abstractions with the much more advanced functionality of the Core Independent Peripherals on the new microcontroller it's using. People have been asking me (constantly) about support for the ATTiny's with those type of peripherals, but it looks like an architecture/design nightmare (not so much coding, though that's non-trivial, but figuring out how to make as easy to use as the other boards without kneecapping it - the CIP's have incredible capability, far more complex than the traditional AVR peripherals, and indeed the ones on most other popular microcontrollers). I've seen no sign of any arduino library work for it; I wouldn't wait for it. In the past few years, Arduino has announced and then never produced several exciting products.
I'd be tempted to use a traditional Arduino board (uno/mega/etc) with an ESP8266 wifi module. This is a very common configuration - there's a lot of info around the web on this. The Yun is probably overkill, and perhaps more importantly, it's nowhere near as popular (in large part because it's bloody expensive, especially compared to the clones of the traditional boards), so there's a lot less written about it and its harder to find knowledgeable people to answer questions.
Also, FYI - the people on these forums don't work for Arduino. Posts from anyone who does are extremely rare. We're all just passionate users, who for some reason help other people with their projects for free.