The Tesla K20X runs at 732 MHz, and has 6GB of GDDR5 in a 384-bit bus at 5.2 GHz. Every other article I've read has explicitly stated those specs for the Tesla K20X, and not the Geforce Titan. The source seems suspect, and might be confusing the specs of the Tesla K20X for those of the upcoming Geforce card.
But in any case, if the rumors are true then the price is too high. If they're going to charge that much for this card, I sure hope the don't severely gimp the DP performance. The gk110 can run at 1/3 SP. If this card runs at anything less than 1/6, I probably won't even consider it. Regardless it should do a lot better in compute than the rest of the 600 series.