The lack of availability has nothing to do with tomorrow's release of the public beta release of myReef. They are just out of stock. They are working on getting them out to their dealers and available online, but keeping up with the demand has apparently been a struggle. One of those good problems for a company to have, I guess.
Also, just to clarify, the only part that needs to get sent to DA for updating is the SID programming module. The controller itself does not need any kind of service and can still be left running on your tank. Currently the SID is only used to update modules. Once it has been updated by DA, it will then be the connection point for myReef to talk to your computer and your controller.