FUD Zilla heard confirmation that AMD won't pull the curtain off its dual-GPU Radeon HD 6990 graphics card until sometime in Q1 2011:
We got confirmation that Radeon HD6990, AMD's dual-chip board codenamed Antilles won't surface until Q1 2011, and we know that we've said before. This is an update. Despite original plans to launch the dual-GPU card based on Northern Islands in Q4 2010, it looks like AMD has decided to postpone this product till Q1 2011.
We don’t know if this is a business decision or that they have some issues but it doesn’t look like we will see Nvidia's dual chip card this year either.