At the W3C TPAC 2018 meeting, the spec editors for the IndexedDB spec agreed that after incubation (in the WICG, which is another less-formal standards group),

At the W3C TPAC 2018 meeting, the spec editors for the IndexedDB spec agreed that after incubation (in the WICG, which is another less-formal standards group), KV storage should "graduate" by being incorporated into the W3C IndexedDB spec itself. (Indeed, they were enthusiastic about the possibility.)