ASUS is preparing one reference based GeForce GTX 780 Ti for tomorrow.
ASUS GeForce GTX 780 Ti (GTX780TI-3GD5) features GK110 GPU with 2880 CUDA cores. Card is equipped with 3GB GDDR5 memory across 384-bit interface. Fortunately or not, it’s only reference based, and so far there is no trace of custom cards.
You can clearly see that ASUS has put DirectX 11.2 support on the box, so I guess this is official now.