Having only just got a pooter capable of runnning SHIII comfortably, and being a Brit that loves the Atlantic theater I doubt I'll be going over to SHIV.
For me being in charge of a U boat is where I want to be, the Pacific doesn't interest me as much.
Maybe I'll try it if I ever get bored with SHIII, but to be honest I'm still enjoying GWX far too much to want to change just yet