There should be, since this will be the only transportation (other than by foot) for BC/YC/BW/Dolphin/Swan Guests. Plan on transportation being sparse; you might want to be at the Pop bus stop by 6:30. Otherwise, you may want to consider strolling over to the Beach Club when you get to DHS - or maybe even just taking a taxi from Pop.
The boats will not be running. We ran into the same problem in Dec. Luckily we received some pixie dust from a great bus driver who took us directly there, which he was not supposed to do. Your best bet is to take a cab.