There are multiple synonyms for the phrase "in the pipeline," which means something that is planned or being developed. Other expressions with similar meanings include "in the works," "in progress," "in development," "in the planning stages," "underway," and "in production." Each of these phrases conveys a sense of forward momentum and anticipation for what is to come. "In the pipeline" is often used in business and technology contexts, but these synonyms can be applied to just about any situation where a project or idea is underway and being actively pursued.