In the on-premise edition all existing output frameworks and/or output options known from the business suite are still available and can be used in the same way. Currently there are also no plans to deprecate any functionality (e.g. NAST, SAPscript, Smart Forms). So basically there are no special actions required when migrating to SAP S/4HANA or starting a green field implementation.
Cloud edition
In the cloud edition the S/4HANA output management is the only available framework for output. Printing is done either done online from the web browser or in the background via a Print Queue and the Cloud Print Manager.
blogs.sap.com
Essential changes in Output Management and Field Length Extension
BRF+ Tcode: OPD Ausgabeparameterfindung