Several have voiced disappointment that Apple didn't have foresight for USB3.0. I didn't have time to respond and can't find thread, Im not saying this is what they did, just that its plausible.
dual sided 8pin lightning (technically 16) example pinout 1
Reversible, 8 digital signal lines, 4 sets of differential pairs like USB3.0. Obviously it would still require new cables with usb3.0 compliant A connectors.
dual sided 8pin lightning (technically 16) example pinout 1
Code:
1---2---3---4---5---6---7---8---
Gnd tx1 rx1 5v. 5v. rx2 tx2 gnd
Gnd tx3 rx3 5v. 5v. Rx4 tx4 gnd
16--15--14--13--12--11--10--9---