in the hopper

(idiomatic) In the process of being prepared or produced.

Example: 1942, "U.S. At War: Revolution from Above," Time, 14 Sept.:
  Already in the hopper was another bill, by Florida's stanch New Deal Senator Claude Pepper, to outlaw poll taxes altogether.
2009, Jay Miller, "Activision Blizzard Swings to Profit," Wall Street Journal, 5 Nov.:
  Mr. Kotick put a lot of faith in the new “Call of Duty” game due out Tuesday and the other titles in the hopper.