Are you trading or holding BTC before CME? Personally, I am holding as I think it will bring more volume and higher prices.
Holding before and selling 5 minutes after the launch.
There is obviously an example of CBOE futures launch on 10 December, when Bitcoin made one of the largest growth in % in 5 minutes time, I think the same will happen upon CME launch. I have a quick video proving my point, would be glad to hear your feedback:
https://www.youtube.com/watch?v=JsR9N-TDBWM