I for one fill that Apple pulled a fast one with the IPad 3. IPad 4 had to be in production when they released 3. It would be nice of them to allow those that just purchased the three to exchange for a four at a modest cost. The returns could be sold to schools, business, or government, without hurting Apple's bottom line.
It was different when they sold the iPhone 4S. Everyone knew that the 5 was coming out soon.