Nero 7 upgrade

Today I’ve seen Nero 7 boxes for sale but going to Nero’s site and looking for upgrade conditions they send me to a point where they ask for my serial number to receive a “special upgrade offer”.
“Regular” upgrade price cann’t be seen in the site.
Does soemone have an information on this please?
I’ve my copy of Nero 6 registered with them as I got it via internet, but nevertheless I find a bit strange to have to submitt my serial number to get the upgrade conditions.