Looks like AT&T giving out free charging plates to those who purchase a Lumia 920 may be part of a bigger proposition. The good news come by way of UK seller Phones4U who put up a link and details on how to get a free charging plate with your 820 or 920 purchase.
The site, nokiafreecharger.com appears to be very much like the free-Lumia 710 back-cover offer from earlier in the year, whereby you purchase your phone and then apply for a free add on accessory, in this case the Nokia wireless charging plate. Details of the offer state that it will be offered from November 2 through December 31st, with the application process starting on November 16th. User should visit the site within 14 days of their purchase, punch in their unique IMEI number, fill out the application and they should have their new charging plate within 28 days.