Manafort and Trump got played. Mueller passed information to Manafort, who passed it on to Trump who included it in his written testimony. Mueller set a perjury trap and Trump stepped right into it. Trump won't pardon Manafort - what is in it for him? So Manafort is totally screwed. No plea deal, guilty pleas and convictions stand, and he spends the rest of his life in prison. Maybe if he is lucky he gets to live in Colorado and room with Blago.
I figure Mueller has already written his report and stashed it in his desk (with copies in the cloud). Before Christmas, Mueller indicts Don Jr. which incites trump to insist that Whitaker fire him. Whitaker does, and Mueller's team gets to spend Christmas with their families.
Come January the Democrats subpoena the report, and Whitaker fights the subpoena in Court. Somehow, the cloud copy gets leaked. Game over.