In San Francisco, the redesign is well under way, and the school board has a link to the redesign process: What Have We Done So Far.
An impresssive parent-organized blog outlines the San Francisco Student Assignment system, and the current process intended to reform it, initiated by the San Francisco Unified School District. One of the early posts assembles some of the relevant materials, including the SFUSD page about the Student Assignment Redesign (including some history and legal context), and the
SFUSD technical description of the current Student Assignment Process (which can now be found here).
Chicago has begun to rethink its school choice system; see New Proposed Admission Policy Information
In Cambridge, Parag Pathak proposed that a strategy-proof mechanism replace the old Boston-style mechanism (no longer used in Boston); see School Assigning Process Criticized--MIT professor presents a possible solution to the problem