R7RS-large is a work in progress, and will not have a single "ratification" event. The work has been divided into editions named after colors, which are cumulative. So far the contents of the Red Edition and the Tangerine Edition have been voted on (anyone interested can vote) and are established; the Orange Edition is currently in preparation.

We use the SRFI process to develop specific components of an edition, which means that all components already have implementations before they are voted on, usually portable ones. See r7rs.org for details.