Let me know. I will ask my buddy tomorrow how it works. I wanted to do NEXT but Ill do whatever so I can get the phone.
I spoke with my Target Mobile kiosk today and confirmed that that particular one will be able to do Next upgrades (assuming you are already eligible)
However, this feature she said is literally being installed tonight in expectation of the iphone release. So, my particular store is upgrading their systems tonight and are fully expecting to be able to do NEXT upgrades.
Also, to confirm, I asked about hold times. They will hold for up to 48 hours if they don't hear from you. If you contact them and request a few extra hours, they will probably help you out.
Surfer, what did your buddy say?