1st of all: Eric what a awsome and ugly creation
i love the topvieuw! especialy the running V-22 is awsome in details. I hope the US will look at your design and rethink there CG-XX programme.....
actually, IIRC, the USN is developing an follow on for the harpoon, but we are not certain what she will look like.
The ''follow on harpoon'' is called the ''Long Range Anti-Ship Missile'' [LRASM] it should fit in mk41 VLS systems. DARPA was developing two variants ''LRASM-A'' sub-sonic cruise missile based on AGM-158 JASSM & a ''LRASM-B'' was a High Altitude Super Sonic cruise missile comparable with the Brahmos it was cancelled in January 2012. In may 2012 they tested some of the sensors and they expect to have a flying prototype early this year (2013) and have it operational in 2015.
The LRASM-A will come also in a air-launched variant for P-8 and other aircraft.
They will first develop the air-launched variant and later the surface launched.
3D Render by DARPA