The order reads:

IT IS ORDERED that in light of impending deadlines and uncertainty about when the Sixth Circuit will act on the emergency petition for rehearing en banc filed by the Ohio Attorney General and Secretary of State, respondents should file a response to this application by 5 p.m. on Saturday, September 27, 2014.

This seems prudent.  At this point, no matter what the en banc Sixth Circuit does, there is a decent chance this ends up before the Supreme Court, and this way it will be teed up for decision in time.