I don't know if this is an issue with React or IE11 but when an the input initially contains an EN-dash (8211) it fires the change event. 
JSFiddle http://jsfiddle.net/uH539/10/

/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @emails react-core
 */
'use strict';
var React = require('React');
var ReactTestUtils = require('ReactTestUtils');
describe('ChangeEventPlugin', function() {
  it('should fire change for checkbox input', function() {
    var called = 0;
    function cb(e) {
      called = 1;
      expect(e.type).toBe('change');
    }
    var input = ReactTestUtils.renderIntoDocument(<input type="checkbox" onChange={cb}/>);
    ReactTestUtils.SimulateNative.click(input);
    expect(called).toBe(1);
  });
});