The new Lightning connector is reversible on both ends, including the USB side of the cable. It obviously is more of a convenience for some iDevice users, who won't have to fumble in the dark to make sure that the connector is in the correct position. Kuo says that the new Lightning cable brings "limited improvements to overall user experience," and isn't worth the additional cost to Apple to include them in the box.
Apple will no doubt offer the reversible Lightning cable as an accessory to be offered to compatible iOS devices. The Apple iPhone 5 was the first iPhone to accept the Lightning cable, instead of the 30-pin connector that had been used since the original Apple iPhone launched in 2007.
source: 9to5Mac via BGR