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http://videocardz.com/39702/nvidia-geforce-gtx-titan-specifications-confirmed-plus-the-latest-leaks
More rumours on different versions/prices.
Update: Not only ASUS and EVGA
Galaxy, ASUS and EVGA are not the only manufacturers to launch the Titan. There will be few versions of it. Some of them are missing the Boost clock, while others are clocked at 900 MHz. According to the rumors, this still leaves a headroom for overclocking. Meaning each Titan could possibly be clocked at one GHz. What is also means is that each model will have a different pricing. Friendly advice, if you are really into buying the Titan, buy the cheapest one and wait for someone to come up with a modified BIOS with boost clock unlocked (but some would actually prefer only one clock mode), and of course wait for proper reviews
Seeing a Titan clocked at 1Ghz would be very impressive and if it's possible on stock cooling then makes the card very worth while in my opinion.
I would assume with the stock cooler being of such high quality and a max temp of 95 degrees, it would be very possible.