Right we did talk about the ASUS ThunderboltEX card before. However, you seem to be overlooking or misunderstanding what was said before.
Apparently ASUS is having trouble certifying their ThunderboltEX card initiative with Intel. The ThunderboltEX card has basically everything on it necessary for Thunderbolt support such as the controller, Thunderbolt port and so on. The "TB_Header" on the motherboard would seem to be a simple type of DisplayPort passthrough from the processors on-chip video subsystem but I'm not really sure.
One thing is for sure though, Thunderbolt won't work on these boards unless ASUS can get them to market and they may not get to market without Intel certification.
The problem with the certification is in part dude to the way video can be used on these motherboards with the ThunderboltEX cards.
One of the reasons we don't see higher-end X79 motherboards (recall that the X79 platform is a higher-end solution then Z77) with Thunderbolt is presumably because Intel video is a requirement of the spec. So I suspect that it was possible to splice in non-Intel video using the ASUS ThinderboltEX card in a way that violated the spec.
Anyway, we were supposed to see ASUS ThunderboltEX addin cards at or near the launch of Ivy Bridge so it's a very bad sign they aren't here at this late stage of the game. They may never make it to market,....
If Thunderbolt support was on the box ASUS may be in for some class action legal issues,...
Here is where we talked about it before:
»Thunderbolt and the future of the PC as we know it?