The anandtech review of the N4 shows there is an option in the display settings for it. Unfortunately its not been added to the N7
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For the moment, it just doesn't seem to be an option as Google hasn't included it in the 4.2 build. I tried to connect up my 3000 with the Wi-Fi direct option, but it doesn't do anything- I suspect it won't work without the option in the display menu.
After the late availability emails today on 4/10 releases to the store, Google is not on my nice list at the moment.
No disrespect intended but we have all heard a lot of rumors of it working but little to show for it. Are you sure you're not mixing up Miracast and Wifi direct? You were able to push video to another display wirelessly using the ptv3000? If so, how was the quality? Could you post some pictures or a video? You would probably be the first non-industry person to do it.