Gainward is one of the first Nvidia's partners to have the HDMI samples. Zotac should be following up soon but it looks like Nvidia sent out the design kits for these cards.
There will be quite a few people that will want to test one of there cards and to put Nvidia’s DirectX 10 in its Multimedia home setups and we know that samples are available as we speak.
The card might be a bit more expensive than the normal 8600GT card but it should not be much more expensive.
Stay tuned for more about it.