The way I read it, they are requesting to withdraw from the case on the basis that the FTC don't have a case to move forward with:
"Withdrawal would advance the public interest and the core purpose of Rule 3.26(c). After a five-day evidentiary hearing, the district court found that the FTC is unlikely to succeed on any of the theories of competitive harm advanced in its Complaint for multiple, independently sufficient reasons. In addition, in the wake of the district court's findings and the court of appeals' denial of injunctive relief pending appeal, Microsoft signed a 10-year, binding agreement with Sony, the principal complainant against the transaction, to keep Call of Duty on PlayStation following the acquisition of Activision Blizzard. Under these circumstances, withdrawal from adjudication is not only mandated by regulation, but would enable the Commission to make a reasoned determination whether to proceed without the ordinary adjudicative constraints of Part 3, including the ban on ex parte communications between the Commission and Complaint or Respondents' Counsel."
And I told you all Jimbo should never have signed that deal.