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From my experience, Sprint has no issue upgrading early if you are within a certain window of time. For example, I called and was told I was eligible for full upgrade on 12/1, but to call back late October or early November and they would see if they could upgrade me early. They have to draw the line somewhere though, likely around 60 days...

Fortunately, I am using another line to upgrade to the EVO on release day and then transferring the phone to my line ASAP and then allowing this other person to use my upgrade in December if they want it... If not, I may grab a WP7 phone.