RHOSP is being made available as both RPMs and containers. DCI allows you to access pre-release bits in an automated way.
Starting from OSP16, components are shipped as Red Hat build system composes rather than puddles. Both composes and puddles are sets of RPM repositories, puddles have flatter hierarchy and cannot be filtered through dci-downloader.
Contact your EPM if you would like a specific version or architecture not listed here.