Well in looking at various weather sites, the storm that I think you need to be concerned with is Tropical Storm Fiona. I assume you leave over the holiday weekend?
As it gets closer to the time you leave, check back on NCL's website. The weather alert button should be right on their homepage by the graphic on the left side.
As Lisa stated, for a Bermuda cruise, the most common change is a change in arrival and / or departure times. However, should a itinerary change be necessary, then it will head either north to New England and Canada, or south to the Bahamas.
2007 - Majesty of the Seas
2009 - Enchantment of the Seas
2010 - Freedom of the Seas