Denon's offering the upgrade on the AVR-4311CI , AVR-3311CI and AVR-991 receivers as well as the 100th Anniversary edition AVR-A100.  They'll also be adding it to the N7 networked reciever and 2.0 channel speaker system.

Marantz will have the upgrade available for their SR7005 receiver, AV7004 networked audio player, AV7005 preamplifier and M-CR603 networked CD receiver.

The addition of AirPlay will allow simple streaming of audio from your iTunes library and will be available for $49 on November 25th.