Although Apple's solution using the mini displayport is technically superior, because it uses less space and you are less likely to plug it the wrong way around (like I always do with usb), Sony's solution will be more consumer friendly, since you'll be able to plug in your older USB devices as well as newer Thunderbolt ones into the same port.
Even more so, you can use this "USB Thunderbolt" with almost any device from crapy USB1 mouse to new USB3 hard drive without forgetting the actual Thuderbolt devices. Why on earth didn't Apple use the same approach? One connector to serve them all... Well, apart from FireWire but Thunderbolt will be replacing FW so not a huge loss there. I have funny feeling that rest of the PC manufacturers will be following Sony on this one. It seems Sony has managed to work an agreement with USB-IF. In all honesty I don't see why USB-IF wouldn't allow it. Apple should have tried harder...