LAX, please stop misrepresenting what is actually in the press release. MAN is indeed one of 10 airports that the U.S. Is looking to take forward negotiations with and whose Governments could be seen as amenable to the idea of pre-clearance, however it is not a given that the airports listed are the 'next 10'.
Also, assuming that a similar process is required to that used to develop pre clearance in Ireland, you firstly have to negotiate to reach an agreement between Governments and there would then almost certainly need to be a change in current legislation to bring the agreement into force. At the same time the airport(s) in question have to develop proposals acceptable under the agreement for the physical location and practical operation of the facility. Not a quick process.