When I try to launch the centos 6.4 ami on the newly release c3 instance type i get 

Client.UnsupportedOperation: The instance configuration for this AWS Marketplace product is not supported. Please see http://aws.amazon.com/marketplace/pp?sku=7w73f3vx0zywcfq1izrshkpjl for more information about supported instance types, regions, and operating systems.

Do you just need to update the marketplace listing to support this or is there more build work and time required.

Thank you,

-jack