Not that is available today,
Have a talk to your account team or reseller, they should be able to give you more information.
The AP1200 is field upgradeable From the AP1200 data sheet you will see
The Cisco Aironet 1200 Series protects current and future network infrastructure investments. Compliant with IEEE 802.11a and 802.11b standards, the modular design of the Cisco Aironet 1200 Series allows for both single- and dual-band configuration plus field upgradability to modify these configurations as your requirements and technology evolve. The 802.11a radio supports data rates of up to 54 Mbps and eight non-overlapping channels that offer high performance as well as maximum capacity and scalability. The 802.11b radio provides data rates up to 11 Mbps and three non-overlapping channels to support widely deployed 802.11b clients. The Mini-PCI form factor of the 802.11b radio allows for upgrade to higher-speed 2.4 GHz technologies such as the draft IEEE 802.11g standard.
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_data_sheet09186a00800937a6.html
