"Kyle plans to testify fully, truthfully and publicly," said Bradford Berenson of Sidley Austin. "Hearings in a highly politicized environment like this can sometimes be a game of 'gotcha,' but Kyle has decided to trust the Congress and the process."
The Hill

Sampson will set off some fireworks by contradicting a key assurance that Gonzales made to Congress and the American public last Tuesday that he was not in the loop during the long deliberations leading up to the firings.

Gonzales probably spoke to Sampson 20 times a day, and had a morning management meeting daily on a range of issues with Sampson and other key officials also involved in the U.S. Attorney deliberations. Gonzales had delegated the replacement plan for U.S. Attorneys largely to Sampson and was monitoring it at "the 30,000 feet level," Sampson's associate says. But Sampson will testify that the Attorney General not only discussed the idea while he was still White House counsel and signed off at the end, but also was "aware of the arc of the whole process" in between, says this source.
US News