I stand corrected. The aircraft that beat out the Orion was the P-8, a maritime patrol version of the 737.
Yep. The P-8A (737-800) Multi-Mission Maritime Aircraft (MMA) has been in T&E at Pax River and will be operational later this year. Current plan is 84 airplanes between FY12-19 to replace 120 P-3Cs.