(Editor's Note: This story has been updated to incorporate additional details obtained since its original publication.) The Defense Department faces significant uncertainty in early 2013 given a two-month deferment of sequestration approved in this week's "fiscal cliff" deal, as well as other factors that could delay the Pentagon's budget process, according to defense sources. The release of the president's fiscal year 2014 budget request could be delayed beyond February, a senior defense official tells InsideDefense.com . "It's entirely possible...