We are rookie DCL cruisers (have only cruised Royal Caribbean), but here's what has been explained to us about the dining rotation.
On your Key to the World you will have your assigned rotation for evening dining in each of the dining rooms. (KTTW - This is like your on board credit card. it will also serve as your room key.) Your wait staff will rotate with you each evening to your assigned dining room, so they will know you. You don't need to choose a dining room since it will be assigned for each evening.
As far as themes go, the. only one I know of is Pirate Night. I believe this is the evening after we are at WDW. There is a show outside on deck followed with a fireworks show from the ship. Really looking forward to this!
DD= Dear Daughter
DW= Dear Wife
DH = Dear Husband
IGT = Inside Guarantee
VGT = Veranda Guarantee
Guarantee cabins will be assigned at a later time rather than a specific cabin when booking the cruise. I know of no way to actually tell how full a ship is for sailing. Seems to be a safely guarded secret by cruiselines.
That will stink if pirate night is WDW night!!! How can we confirm this???