I've been reading that beginning on September 1 and expected to last through September 26, the Walt Disney World Resort monorail service hours will be changing those posted below.
Magic Kingdom Resort Beam: 8:30 a.m. " 11:00 p.m. (12:00 midnight on hard ticket event evenings)
Magic Kingdom Express Beam: 9:30 a.m. through 1 hour after the Magic Kingdom fireworks
Epcot Beam: 9:00 a.m. " 11:00 p.m.
SO after September 26 we're expecting normal service to resume? We were at MK last Sunday and the monorail closures were not on my radar at all. Caught me off guard that we had to take the ferry!
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Trip Reports:
December 2013: 10th Anniversary, 1st DVC Stay | April 2014: Birthday on the Boardwalk | May 2014: Star Wars Weekend, Navigating WDW with a wheelchair | August 2014: Villains Unleashed | September/October 2014: MNSSHP, F&W, Tower of Terror 10-miler | March/April 2015: Disneyland and California Coastal Cruise | November 2015: Wine & Dine Half, Food & Wine, 1st Disney Cruise | February 2016: Presidential Classic Gymnastics Meet | March 2016: "Work" Trip, Tours, F&G Festival | April 2016: Conference at Disneyland | Fall 2016: Festive Fall Fun | January 2017: Festival of the Arts | May 2017: AbD Backstage Magic | July 2017: AbD San Francisco | Sorry I had to give up doing trip reports. Too many time commitments right now.
This is also helpful info for us. Fortunately, we'll likely be on a resort bus to MK when the monorail isn't running and would only need it midday or early evening to transfer between MK and Epcot or to go to one of the resorts for an ADR.
Yep, I was only really planning on using the monorail in the middle of the day to go to/from Epcot or to do a loop, so this shouldn't affect me! 
SO after September 26 we're expecting normal service to resume?
At the moment that's what it sounds like, but of course needs of the company always come first.