A multi-stakeholder expert committee was formed by the DG, WTO to look into the challenges and future of the WTO. It was called the Panel on Defining the Future of Trade. It's report is expected in April 2013.
Talal Abu-Ghazaleh, one of its members, has offered some useful suggestions in his work titled "WTO at the Crossroads:A Report on the Imperative of a WTO Reform Agenda".
An interesting, easy read for those looking at the future of the multilateral trade institution.