Will there be new call signs for the Caribbean Netherlands?

No, the current call signs issued for the Netherlands Antilles are maintained. Your call sign will not change. For Bonaire, this is PJ4, for St. Eustatius PJ5 and for Saba PJ6. Radio amateurs coming from the Netherlands can use their own call sign, with the addition of Bonaire/PJ4, St. Eustatius/PJ5 and Saba/PJ6.