The work that has been going on in Central Plaza, between the end of Main Street U.S.A. and Cinderella Castle, has been going on for a little while. New pathways, gardens, and viewing areas for the fireworks have been added, but another addition has been made.
Disney has debuted new turrets on Cinderella Castle today. They extend out to the side from the castle. The reason for this new addition is to connect the castle to the expanded area. With the new turrets extending to the sides it adds to the overall royal look of Cinderella Castle.
Here is a rendering from Disney Parks Blog
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Source: Disney Parks Blog