Puzzled by all this MMA vs MPA talk.
As I understand it, MRA4 was only budgeted to be armed with torpedoes. The P-8A is designed to carry Harpoon, JSOW and mines, not to mention the AAS, which is presumably where the MMA name justifies itself.
However, any MPA will have a radar, ESM, EO/IR, extensive comms and flexible workstations, and will be able to do overland ISR, SAR support and the other things that we expect MPA to do.