On the Visa Q4 2011 Earnings Call yesterday, Visa stated "We're also moving forward with our modified debit economics, including the implementation of our network participation fee and the reduction of variable acquiring fees on debt, Visa debit and Interlink. As stated last quarter, we believe this offers merchants greater incentive to route transactions over our network and an opportunity to lower their per-unit transaction costs. As for details, we anticipate providing the specific pricing information to merchants and acquirers in January, which will go into effect on April 1."