On August 27, the federal government refused to exempt Alaska, Colorado, Hawaii and Wisconsin from the new federal law that tells states they must mail overseas absentee ballots no later than 45 days before the election. See this story, on how the denial of the waiver affects Hawaii. It is likely that these states will now consent to count foreign absentee ballots even if they arrive late.
Also see this story. The federal government also denied waivers to the District of Columbia, and the Virgin Islands. However, it granted waivers to Delaware, Massachusetts, New York, Rhode Island, and Washington.