The question of dual citizenship depends on the legal situation at the time you receive your naturalization certificate. If you meet all the requirements, you will initially only receive an assurance of naturalization from the authorities, in which you will be asked to renounce your previous citizenship.
This assurance of naturalization is usually valid for two years. As the new law comes into force on June 27, 2024, you can then be naturalized without having to give up your previous citizenship.