Although the present situation seems to have commenced less than 24 hours ago, I think it significant that nothing drastic has happened as yet; if the Turks were up to serious mischief, they wouldn’t have waited this long to make a move against the base itself, and if another “coup” is brewing, it has yet to show itself.
Going by several different sources, (some links below), “the move is a surprising action taken against an important U.S. strategic asset.” Turkey cut power to the base for almost a week after the recent coup attempt, requiring internal power generation. This will have been deeply worrying to the U.S. military, and Dr. Michael Rubin, a middle east expert at the American Enterprise Institute, is quoted by the Daily Caller as saying that “the Turkish government’s actions were akin to taking Incirlik airbase hostage” (1).