Firmware Version 1.4.0 incorporates the following enhancement:
重大更新来囉，还记得这部影片吗？ 那惊人的对焦速度，
https://youtu.be/uuQiqd-a32g
Enhances eye detection Auto Focus (AF) for improved face and eye recognition
at greater distances.
提升远距离的眼部自动对焦及脸部辨识能力
Improved Auto Focus (AF) performance helps the camera to focus on and track
smaller subjects.
加强自动对焦的效能，让相机更能追踪小的物体
Reduces lag time between the actual Auto Focus (AF) and the AF frame display
for images in the viewfinder or on the LCD.
减少透过EVF 自动对焦时的 lag 时间
Fixes a phenomenon in which the AF frame size cannot be changed in the Servo
AF setting.
修正伺服自动对焦时，无法更改自动对焦框大小的问题
Fixes PTP communication vulnerability.
修正图片传输协定的漏洞，应该是资安问题
Mac 下载 http://pdisp01.c-wss.com/gdl/WWUFORedirectTarget.do?id=MDQwMDAwNTA0MTAx&cmp=ARH%E2%9F%AA=ES
Windows 下载 http://pdisp01.c-wss.com/gdl/WWUFORedirectTarget.do?id=MDQwMDAwNTA0MDAx&cmp=ARH%E2%9F%AA=ES
资料来源： Canon Rumors