My Internet connection is too slow for me to read all the latest pages since my last visit, so excuse me if this has already been posted.
Seems like there's a new ThunderBolt solution coming to town, the Silverstone T004:
http://www.bit-tech.net/news/hardware/2013/06/06/silverstone-external-graphics-card-case-deb/1
http://www.anandtech.com/show/7040/computex-2013-thunderbolt-graphics-from-silverstone
http://accesstechnews.blogspot.com.au/2013/06/computex-2013-thunderbolt-graphics-from.html
Apparently there will be a 450W PSU built-in, which should power most (if not all?) cards available today. It also supports PCIe 3.0, so when support for PCIe 2.0 is inevitably dropped it's still upgradeable. According to Computershopper the price will be about $200 - $300, which seems very affordable for a Thunderbolt accessory of this caliber. No news of a shipping date though (I hope it passes the ThunderBolt certification process).
I know what I'm buying as soon as it ships, finally I can have a laptop that it is possible to game with when at home, yet light enough to use "outside" all day. Since it's a all-in-one with the PSU as well, it's simply plug-n-play (hopefully).