From the Federal Register:
"The United States Patent and Trademark Office (USPTO) is initiating the Fast-Track Appeals Pilot Program to provide for the advancement of applications out of turn in ex parte appeals before the Patent Trial and Appeal Board (PTAB). An appellant who has filed an ex parte appeal and received a notice that the appeal has been docketed may file a petition, accompanied by a petition fee, to expedite the review of his or her appeal. The Fast-Track Appeals Pilot Program sets a target of reaching a decision on the ex parte appeal within six months from the date an appeal is entered into the Pilot Program."
"The Fast-Track Appeals Pilot Program is offered on a temporary basis, and petitions to request inclusion of an ex parte appeal in the Pilot Program will be accepted until 500 appeals have been accorded fast-track status under the program, or until July 2, 2021, whichever occurs earlier. The USPTO may extend the Fast-Track Appeals Pilot Program (with or without modification) on either a temporary or a permanent basis, or may discontinue the program for either insufficient usage or after July 2, 2021."
For more details see the Federal Register Notice.