These specs are by no means official or finalized, but they do give us a general idea of what to expect when the processor family [allegedly] launches on August 13th. The only processor that AMD has confirmed at this point is the Ryzen Threadripper 2990X, and HWBOT says that this 32-core (64-thread) processor has a base clock of 3.4GHz and a TDP of 250 watts.
The [currently] unconfirmed processors include the 24-core (48-thread) Threadripper 2970X with a 180W-TDP and the 16-core (32-thread) Threadripper 2950X with a 125-watt TDP. The former has a base clock of 3.5GHz, while the latter has a base clock of 3.1GHz.
There are two big takeaways from this information leak. For starters, AMD has been able to make some power efficiency gains with this new 12nm process, as the 24-core Threadripper 2970X has the same TDP as the current-generation 16-core Ryzen Threadripper 1950X. Secondly, the Ryzen Threadripper 2950X is clocked 300MHz lower than its Ryzen Threadripper 1950X counterpart. We'll have to see in benchmarks if architectural optimizations will be enough to overcome the clock speed deficit.
The flagship Ryzen Threadripper 2990X has shown up for preorder via European retailers in recent weeks with prices ranging from around $1,700 to $1,850 USD. Those prices are straight converted to USD, so it's likely that U.S. pricing could be lower. For comparison, the Ryzen Threadripper 1950X debuted last year at $999. As recently as this month, however, it could be had for the low, low price of $699.