UPDATE: Softimage 2012 is not released yet, but it is coming, so I thought I’d start posting some information about the release.
For most customers on Gold Support, download is the default delivery method for the 2012 upgrade.
If you want a box, head over to the Subscription Center and change the delivery preference from “download” to “box” in your Subscription Center profile settings.
There’s a number of Subscription Center tutorials posted on autodesk.com, including one on downloading your software.