Here is a recent article in Aviation Weekly and Space Technology about the P-3 replacement.
"The first P-3Cs need to be retired in 2003, the signals intelligence EP-3Es in 2004."
"The replacement systems, known as the Multi-mission Maritime Aircraft (MMA), are slated to be fielded around 2010-2012."
"The Navy plans to have two versions of MMA, the Search Attack version taking on the P-3's mission, and the surveillance/intelligence aircraft replacing the EP-3. THe search/attack aircraft may also have to conduct strike and mine warfare missions and noncombat actions supporting counter drug operations."
"History does not long entrust the care of freedom to the weak or timid." D. Eisenhower