We're finishing up the necessary work to make the packages available. We expect to be able to publish a patch soon that will enable the "packages" above Open-Beta. These would include the starting items advertised (stacks of Wall, start with a Plasma Rifle, etc) - the only thing in those sets still being worked on are the two unique armors (awaiting art) and the 3 unique voxels (also awaiting art).
The "Developer Corner" forums will be made available shortly, we will post an announcement when they are opened and email everyone who should have access (to the email that bought the package) - so if you're not sure if they've been released, just check for a reply/announcement here.
Thanks all!
-grist