See Add ERC: Partial and Extended ERC-4626 Vaults by Joeysantoro · Pull Request #157 · ethereum/ERCs · GitHub for the most up to date draft
Abstract
The following standard adapts ERC-4626 to support multiple assets or entry points for the same share token.
It adds a new share method to allow the ERC-20 dependency to be externalized.
This also enables Vaults which don’t have a true share token but rather convert between two arbitrary external tokens.
Lastly, it enforces ERC-165 support for Vaults.