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 (Bahamas)
2009 - Enchantment of the Seas (Western Caribbean)
2010 - Freedom of the Seas (Western Caribbean)
2013 - Golden Princess (Alaska, roundtrip from Seattle)