>> Do you think the Cortex-A57 will be introduced with a clock rate below 2.1 GHz?

> whether it will make it to (or above) 2.1 is questionable.

No Dhrystone, but more real-world comparison by ARM Ltd. between Cortex-A57 and Cortex-A15:

http://www.arm.com/images/A57performance_webpage.png