Be sure to pack layers.
AWIS/NWS is forecasting several cold patterns to continue along the south during the next couple weeks. I don't know if they will reach all the way to Orlando, but I'd want to be prepared if they do.
We were in the World in early Jan. when the major cold spell hit. It was very cold, and I was glad I had packed coats, hats, scarves and gloves for the family. We used them. If I were going in the next couple weeks, I would definitely pack all that again, especially if you are driving down.
However, as always with Orlando, be prepared for warm weather too. We were in teeshirts on new years eve.
Keyword: Layers.