The Inquirer has an article up about the estimated chip speed of the Clawhammer.
If you read a bit into that Sanders quote, you can see that the Hammer has a 33 per cent gain in IPC/Power. That means, a 3400 PR in Hammer speak is the same as a 2550 Palomino.
That makes it 633MHz faster than a Palomino 1400-1600PR (2550-1600 / 100 *66 = 633), or 2033MHz. If you again make an assumption that it will have a faster 100MHz multiple bus, that puts it at 2GHz.