with an experimental firmware to gain crappy functionality but will not work properly until an official update is released.
Edit: The Netgear PTV3000 IS now certified and works great! It's also cheaper than most and is the only stand alone Miracast adapter that can be purchased at Best Buy (or any other offline store for that matter).
not only works with the N4 but works great! And if you're not a big fan of Actiontec devices, here is a direct link to the Wi-Fi Alliances list of
Official Miracast Certified Recievers
which are certified (imagine that) to work with the Nexus 4.
Happy screen beaming