The Ghent Workgroup (GWG) has published their first specification for digital print on cut sheet. The new specification is based on the GWG specifications 2015 for offset printing. Some requirements have been relaxed (e.g. overprinting) or lowered (e.g. minimal image resolutions). There is only one variant available for PDF/X-4 CMYK+RGB (images with ICC profiles allowed). So far there are no preflight profiles officially available for this specification.
PDFX-ready has already released a preflight profile for toner based digital printing in 2015. This is mostly identical to the new GWG specification.