https://hackaday.io/project/8678-rpi-wifi
Looks like they are planning to offer a few for sale eventually.
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.
Keep an eye on etailers that won't back-order, and just nab one when they come into stock. There's a stampede, but it's then luck of the draw.
At least, that's what I hope they're doing with it.
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.
With the early RPi it was a bit different because of USB power problems and kernel bugs, but those are mostly solved.