As explained by the FBI Director Mueller about 9 months ago, he expected the matter to come to some sort of resolution in the relatively near future.
The matter is extremely complex, the FBI has said.
And the old saying is that the wheels of justice grind slowly.
The FBI told Judge Walton 3 years ago that they just needed another 6 months to wrap things up. Walton was then given a “super secret briefing with super secret information”. Walton laughed them out of court. He said he saw absolutely zero progress nor any sign that progress would be made in the forseeable future.
But of course you will just argue that Walton wasn’t shown the “super, super secrets” that only 1 or 2 people in the FBI even know about (let’s hope they never fly together).