My iMac is not the “iMac 11″. My MacBook Air is not the “MacBook Air 4″. The iPod line changes, but the name remains the same. This will undoubtedly happen to the iPhone line as well. Just as the spec is dying (more than partially ushered to the grave by Apple), the ascending number naming race is dying too. It’s about simplicity.
I actually find it refreshing that they’re letting go of number naming. Less complicated. It’s just gonna be the iPad. I expect (and look forward to) the iPhone following suit.