Even though the nationwide release of the HTC EVO 3D is just days away, there's still time to check your upgrade eligiblity and possibly do something if you're not eligible for the discount until a much later date due to Sprint's recent two-tier Premier program change.
The previous method of getting a one-time courtesy upgrade was to email [email protected] and ask for it. While this may still be effective, there's now a more direct path to getting the new phone for $199.99 this week.
Just put your cell number, whatever name is on the Sprint account you want to upgrade, and the date that your upgrade was or would have been available (if not for the program change) in an email and send it off to [email protected], a new inbox the carrier created exclusively for this purpose. Then just cross your fingers and wait to find out whether your upgrade has been restored.
The outcome would probably be the same if you contacted SprintCares instead, but at least with UpgradeRestore you don't have to suck up to or threaten Sprint to try to get what you want.