As posted here on the SRU Implementors list, the OASIS Search Web Services Technical Committee has announced the release of five Committee Drafts, informally known as:
Abstract Protocol Definition (APD)
Links to specific document formats are given at the bottom of the mail. A list of the TC public documents is also available here
The next phase of work for the TC will be the development of SRU/CQL 2.0, and the Description Language.