So far I've heard a few laptop manufactures, believe Asus and Acer (or MSI, not 100% sure on those) are planning on adding Thunderbolt using the miniDisplayPort connection released around the time of Ivy Bridge. Sony's Thunderbolt, if they haven't modified it already, is suppose to be a modified USB 3.0 port, but that's not possible to do as the USB Implementers Forum denied Intel and Apple to use it for Thunderbolt as "USB was not open to modification in this way" as they said. Knowing Sony, it's probably some proprietary connector.
It can support up to a 150W card, so that can be a pretty decent card.
I'm hoping that when I do my next computer hardware upgrade with Haswell, Thunderbolt will be included on many motherboards, so by that time, prices should start leveling out. I just want a motherboard that has only a couple ports, for example 2 Thunderbolts, 2 or 4 USB 3.0 and audio with everything else in a desktop hub, FireWire 800, eSATA, Gigabit ethernet, 4 more USB 3.0 ports, and of course another Thunderbolt port.