If they stick to the regular schedule, yes it would open at 7:00 for EE.
However sometimes on holidays they change the regular schedule. EE was supposed to be at MK on Christmas, but they changed that to help divert the crowds away from MK on such a busy day. I believe I heard they did the same on Thanksgiving too.
The only way we found out about Christmas was when we checked into the Poly on 12/24 I saw on the tv channel that shows the hours and stuff, that EE was at the MK that day. Knowing it shouldnt have been, we checked at the front desk and they told us Wed & Thur were swtiched that week. So, be sure to double check when you get to your resort.