A new draft of MathML3 has been released: http://www.w3.org/TR/2010/WD-MathML3-20100610/.
This is (again) a Last Call draft. There were sufficient changes and clarifications resulting from the Candidate Recommendation review draft that we decided to issue a Last Call again, to allow people to comment on the changes before (hopefully) we progress to Proposed Recommendation status.
We have provided a Diff marked version and a List of changes to make it easier to review the changes since the CR draft.
