The cover not only allows you to wirelessly recharge your handset (and you can imagine how fast the battery will run down with all of those pictures that you're going to take), but also protects the phone from your butterfingers, like a regular case might. The Nokia Lumia 1020 comes with a 2000mAh cell, but that is asking for the gerbil on the wheel to be doing an awful lot of spinning.
We do not have any pricing information for the wireless charging cover, and we're not sure when it will be available. Hopefully it will be ready for purchase when the phone launches. That date is July 26th for AT&T customers in the U.S., where the phone is an exclusive in the country.
source: PureViewClub via WMPoweruser