Bluetooth tethering from the iPhone to the iPad does not work. Period.
Netshare App (the old tethering application apple removed shortly after it was released) also does not work.
MyWi on a jailbroken iPhone is the only way of tethering, by turning your phone into a wifi hotspot / access point.
Unfortunately, i think MacRumorUser is correct
I just got my iPad today and no luck at all with the tethering either.