Test the Wireless 802.11ac card in a MacBook Pro 15'' Retina
Could you please try using the 802.11ac card from the latest macbook air in a Macbook Pro 15'' Retina?
If it works, i'd like to order an 802.11ac card!
Adrian - Review these answers 802.11ac wishers.
The best thing here is to add your comment to the '13 teardown doc so the people at iFixIt see the pent-up want for them to do the needed testing as they have the hardware right now.
As I said before Apple consumes parts at such a rate (as well as contracts for them) new chips and parts like this one will be in short supply for quite awhile. So you'll need to wait until they show up on the open market thats assuming the board will even work in your older system.
802.11 ac will do nothing for your internet speed unless your isp offers something like 500mbit/s speeds or you transfer or stream files.
There are three possibilities.
1. The retina has three wires connected to the wireless card (from what I can see). This is good. In the past Apple has been nice remember g to n in the old MacBooks? Apple will make the card!
2. The retina is capable but Apple says no, a third party eventually releases a internal card!
3. The retina is not capable because of the antennas and you need to buy a usb 802.11ac device.
I have a 15 retina and hope that apple made this work for ac. However its really not like my 802.11n with time capsule is slow in anyway. Its really only for file transfers. I have a very fast internet speed compared to most 100mbit/s download. My 802.11n is more than capable to get the most out of the speed I have. So remember unless you transfer a lot of files over a network or have a 1gbit/s internet speed which I doubt, this upgrade will do little to nothing for you in speed increase on the network.
Theoretically it is possible because the size and interface of the networkcards are the same, but i don't know if the ac card needs extra drivers that only come with the 2013 model. If the 2012 has the drivers it would almost certainly work. But i really think ac isn't necessary and of any use.