So it seems apple has swiched to the new mag safe II connector, which is all great and dandy. However, the only adapter I see is to convert old power supplies to the new machines. So do the new adaptors being sold have the new MagSafe II connector? If so, how do you use them with an older machine? Or do we have to buy used ones from now on? Which I don't mind, but we better stock up in that case