The console is up for pre-order through Ouya right now. All orders received prior to December 8 will guarantee the console arrives "in time for gifting."
A new update, planned for later this month, will unlock external USB storage on all Ouya consoles. This new update also presents many changes to the UI and how games are listed in the "Discover" area. The next iteration of the Ouya hardware is planned for 2014.