No idea sorry. The best I can find is this link http://www.techpowerup.com/144081/PowerColor-HD-6850-SCS3-Silent-Graphics-Card-Final-Iteration-Pictured.html
which just says "PowerColor's new HD 6850 SCS3 finally taken shape, and will launch soon."
I'm not sure how much longer the 6850 line is going to be around, PowerColor better get a move on.
You can still easily find a wide selection
of HD 3000 series video cards in 2011. And the same goes for HD 4000, HD 5000, so why would you expect they need to hurry to make passive HD 6000 cards?
At least where I am cards will hang around for a long time but as they will only get cheaper for so long. After which they start to get more expensive as they become harder to source and as newer better value cards are released.
I think that is true the world over, but maybe it's worse in Australia?
FWIW the prices on newegg for the low end fanless cards is
Radeon HD 3450 $35
Radeon HD 4350 $41
Radeon HD 5450 $38
Radeon HD 6450 $53
Radeon HD 4670 $75
Radeon HD 5670 $103
Radeon HD 5750 $135
There isn't a high power fanless HD 3000 series card still in stock. And the high power fanless HD 6000 cards haven't shown up yet.
And with fan:
Radeon HD 4850 $120
Radeon HD 5830 $160
Radeon HD 6850 $160
I think the effect you mention is much more of an issue as you get into cards where supply is extremely low. I saw that effect the most with AGP cards being more expensive than PCIe and the gap increased as AGP became less common.
But the start of all this was saying somebody better hurry to make fanless HD 6000 cards before AMD stops making the chips. I'm just saying supply of the HD 6000 series chips won't be an issue for years to come. I don't think anybody has to hurry. I'm not seeing any shortage of supply of prior generation parts.