In March 2018 the first version of the ISO standard 15930-7 (PDF(X-4) was published. We have been working on this specification in the ISO TC130/TF2/WG2 committee for almost three years. It was the first big and important update since the original ISO standards PDF/X-1a and PDF/X-3. In PDF/X-4 new features like transparency and layers are allowed for the first time.
At the beginning the acceptance of the new standard was slow. But a recent survey conducted on PDF-AKTUELL reveals that in the meantime PDF/X-4 is the preferred format (at least for the readers of PDF-AKTUELL 😉 ).
PDF/X-4 is also the recommended format of PDFX-ready. The recipes, settings and preflight profiles version 2.x for offset printing with CMYK, offset printing with CMYK and RGB images as well as digital printing are based on PDF/X-4.