I'm still waiting for a Zero. A Zero with onboard Wifi would be brilliant: really small, needs little power, and you don't need to hook it up to anything but the power supply.
Seems like you'd get a Pi Zero before you'd get a chip. They don't start shipping until June, and I see Zeros in stock for a few seconds (some on Adafruit yesterday, although they sold out in seconds).
I have a CHIP, from the Kickstarter campaign. It really is a better deal than the Pi Zero, unless you have Pi-specific needs. It's much more powerful than the Zero in my testing (though not quite as powerful as the Pi 2) and the built in Wi-Fi/BT is awesome. The fact you can attach a LiPo battery and have it managed by an onboard power regulator is worth the whole $9 as far as I'm concerned.
The only downside is no HDMI or even VGA until the respective adapters come out...in June. I currently only have one screen in the house with a composite input and it's not always available for tinkering.
Another downside is the size of the community. I think this is why the pi is going to be around for a long time despite not having the best tech specs around. There are all kinds of tutorials for hundreds of projects and the prevalence and availability of rpi forums further lower the barrier for entry.
Couldn't you already just plug a fairly cheap USB dongle in your rasperry pi ? I'm not sure I see what the big deal is, aside from probably making the price cheaper and freeing up a usb slot
If you've ever tried to get wifi working (esp on earlier RPis) you'll understand it is not that simple. Especially for newbies. Having said that its a good baptism of fire.
Raspberry Pi with built in wireless comms means it uses a standard piece of hardware so the software stack can be configured to work out of the box. That can't happen with the existing arrangement. Also the power supply problems with original Pis are frustrating to say the least. These are most evident when plugging in USB wifi devices. Again having a standard integrated piece of hardware will (hopefully) avoid this.
You're fairly limited in terms of antenna size/placement when you use a tiny dongle. If it's built into the Pi, they could have the antennae wrap around the edge (similar to how the iPhone does it) to allow for a much higher quality connection.
At least, that's what I hope they're doing with it.