unknown9122 :
Good stuff. Thunderbolt is the future. But the flatness of the USB port allows for thinner PCs. The thunderbolt port has more vertical length.
Thunderbolt is likely not the future. The concept of Thunderbolt (using external PCIe lanes) may be the future but Thunderbolt in its current iterations are certainly not. Thunderbolt hasn't become widely adopted because of the ubiquity of USB devices. If I buy an external hard drive I'm going to buy a USB 3.0 drive because I know I can plug it into any machine made in the last 15 years, even an old beige tower with USB 1.1 ports. Thunderbolt drives are only going to work on the newest and most expensive machines and offer minimal speed improvements over USB 3.0 for single drives. If a USB 3.5 solution can provide Thunderbolt-like speeds while still maintaining backwards compatibility with previous USB standards then it may be the better solution for users requiring faster external devices.