Yes, to enter the bypass you need to go to the Christmas tree near the train station, the entrance is next to the Mickey/Tinkerbell meets.
I just did a Merrytime cruise and a
MVMCP, you are in good company!
I'd line up at 6:30ish to be near the first to meet Ali and Abu.
I would think most of the people would be over at DHS in line for ROTR on that day. Just a guess.
I had the hot chocolate and I'd be shocked if there was milk in there. Powdered mix with water all the way, according to my taste buds. You could always ask before you grab one, to be safe.