Via the National Weather Service:
The six lists above are used in rotation and re-cycled every six years, i.e., the 2013 list will be used again in 2019. The only time that there is a change in the list is if a storm is so deadly or costly that the future use of its name on a different storm would be inappropriate for reasons of sensitivity. If that occurs, then at an annual meeting by the WMO committee (called primarily to discuss many other issues) the offending name is stricken from the list and another name is selected to replace it.
Sandy has been retired from the list. Forecasters are predicting a “worse than average” hurricane season, which officially starts on June 1st.