The people who purchased their NCs from HSN were supposed to get the update first. I assume B&N keeps track of MAC IDs or some other electronic number and sent devices with a specific range of numbers to HSN.
My guess is that the update is nearly live and B&N is testing the update procedure on their servers. They probably screwed up the filters and it caused roberto's device to see the update. I suspect that the HSN devices will begin updating within a couple days (perhaps this weekend), and then all other devices will follow a few days to a week later. Granted, this is pure speculation on my part.