Eh, I guess if you're a laptop user and also happen to commonly use a super fast external RAID, this is good news.
For everyone else, I am not quite sure about the practical applications for the next few years.
Individual drives (even SSD's) aren't close to maxing out the throughput of USB3, so if you're thinking TB will somehow magically speed up transfers from your 2.5" drive that tops out at 100MB/s, you're unfortunately mistaken.
As a "single-cable desktop bus", I still don't think it's fast enough. Adding in DisplayPort to handle the high bandwidth video is a good patch, but if this is supposedly some "future-ready" high speed one cable solution, it's just not going to have the balls. 10gbps sounds like a lot, but once you start adding up overhead it starts disapearing quickly. 1gbps for ethernet, 4gbps for USB3, 2gbps for firewire, 3gbps for eSATA. Want to run something else? Too bad, you're out of room.
The external graphics card concept is one I find very intriguing for notebook users. It has been attempted before over 1x links by other manufacturers and it just works all that well. For comparison, most high end graphics cards perform the best when installed in a PCIe x16 slot, which has a theoretical bandwidth of 40GB/s. That's a lot of data. I doubt we will see the 100gbps implementation any time soon just because mobile chipsets (and even desktop chipsets) are already taxed for PCIe lanes.
Overall it's an interesting concept, but I don't think it is going to catch on outside of Apple's expensive monitors and a few high end niche RAID products.