The W3C XML Query and XSL Working Groups has updated the Candidate Recommendation XQuery 1.0 and XPath 2.0 Data Model (XDM). The changes since the last draft don't feel too huge.
The W3C XQuery working group has also posted the third working draft ofXQuery Update Facility. XQuery as it currently exists is basically just SELECT in SQL terms. This is INSERT, UPDATE, and DELETE. More specifically it is:
upd:mergeUpdates upd:revalidate upd:applyUpdates Update Primitives upd:insertBefore upd:insertAfter upd:insertInto upd:insertIntoAsLast upd:insertAttributes upd:delete upd:replaceValue upd:renameChanges in this draft appear to be primarily editorial.