I've just read the review in full and I can see that even when TITAN is clocked to even faster than the GTX 690, the GTX 690 still handily beats it, as you can see below. I was somewhat surprised and disappointed by that.
I guess the reason is that the dual GK104 effectively makes for a "bigger" GPU since it has an effective bus width of 512-bit and 64 ROPs when one considers the two GPUs as one chip.
Overall, I'd love to have one, but the sky high price and the fact it doesn't beat the GTX 690 in straight-line performance even when overclocked are disappointments. I reckon that the extra RAM could allow it to beat the 690 in multiple monitor scenarios perhaps, where it's memory would max out and performance drops significantly.