Article 98: The Facts
This Article gives the European Commission the ability to propose changes to existing EU legislation where it might conflict with the GDPR.
The Commission shall, if appropriate, submit legislative proposals with a view to amending other Union legal acts on the protection of personal data, in order to ensure uniform and consistent protection of natural persons with regard to processing. This shall in particular concern the rules relating to the protection of natural persons with regard to processing by Union institutions, bodies, offices and agencies and on the free movement of such data.
(Article 96 gives a bit more detail on this, saying that pre-GDPR agreements made by EU countries concerning transferring personal data overseas stay in effect until they are changed or revoked. See the Article 96 post for my view on that.)
In short, expect plenty of other laws to be changed over time, especially in the light of legal test cases.