Upgraded three phones in December
We have five phones on our personal plan with Sprint. I upgraded my wife's phone to an iPhone 4S using an upgrade we had for her wifi card. The day after Christmas, I saw a posting from Sprint insiders saying that Sprint would do early upgrades before 12/31/11 for customers who are part of their about to be defunct Premier program. I went to a Sprint store yesterday and was able to upgrade both of my son's phones to the 4S, even though they weren't eligible for upgrades until March and July of next year.
The rep at the Sprint store said they were doing it for Premier customers to lock them up for two more years. He said they weren't advertising it and it could only be done at Sprint owned stores, not authorized retailers/resellers.
Not sure if that is true, but i was thrilled to be able to put iPhones in my lovely bride and our two son's hands this Christmas.