And this charge could be falling apart with the recent allegations that the FBI said he didn't lie, until forced to change the narrative by the DOJ. I know speculation is that Mueller asked to postpone the sentence hearing because something big was coming.
I think it is (my own speculation for the libs out there) more likely Mueller asked for the postponement because of this story. He'll dig deeper, find the truth, and drop charges against Flynn... Face it.... IF the DOJ changed the narrative, or forced the FBI to change it, Flynn is not guilty of anything