Marcan is one of the key members of failoverflow and a lead hacker in the Wii/Wii U scene. He apparently has some sources in the know, aside from confirming the exact specs of the Wii U himself through hacking means.
Originally Posted by Marcan
If you want more evidence that MHz isn't everything, a little birdie points out that Durango (Xbox 720) is specc'ed to have a 1.6GHz CPU.
Food for thought. (And don't bother asking me who that little birdie is.)
Lock if old, I did a quick search and came up with nothing... but the tweet is 14 hours old so I wouldn't be surprised if I missed something.
(edit) Whoops, forgot to put the source. https://twitter.com/marcan42
(edit 2) Some clarification edits.