Bush feels that the "review of Afghan policy" could not wait for Obama to get up to speed...

CNN, here and here

"...What happens in Afghanistan is, in part, dependent on what happens in Iraq. McKiernan has said publicly that he needs three more U.S. combat brigades in Afghanistan. But, according to a U.S. official familiar with troop assignments, the most the United States could send to Afghanistan is two combat brigades by spring 2009, because the Army and Marines are stretched...

According to a U.S. official familiar with troop deployments, even if Obama pulled substantial numbers of American soldiers out of Iraq the day he comes into office on January 20, 2009, and redeployed them immediately to Afghanistan, they wouldn't arrive there until June or July 2009 because of the complicated logistics of redeploying.....That would be too late, because the spring will bring new Afghan fighting after a winter lull..."