A few years ago I picked up Weird War II by Pinnacle Entertainment Group to supplement my The Day After Ragnarok book with World War II Savage Worlds rules. The rules were fine -- it helped with the demolitions skill and gave me access to an armory of guns and vehicles -- but just wasn't weird enough for my taste. The history of the weird war was pretty much the same as the history of our war; the weirdness was at the edges and never infected the larger narrative in the way that, say, Delta Green did.
Achtung! Cthulhu looks more my speed. The project kickstarter by Modiphius Entertainment proposes creating the Lovecraft-influenced campaign for the Call of Cthulhu RPG for £8,000. More interesting to me is the first £11,000 stretch goal, which adds Savage Worlds compatibility via the Realms of Cthulhu rulebook by Reality Blurs. The project's introduction has me drooling (and not out of madness):
This is a full blown tome of dark knowledge that will detail secret Nazi plots, Allied & Nazi special forces & intelligence agencies, mystical missions and wonder weapon development, mythical organisations, campaign and plot ideas, key characters, vile creatures, and new rules for World War Two combat and equipment - a whole shoggoth's worth of Cthulhu villainy, enough for any Keeper to have his investigators dead, insane, or running for their lives! The Keepers Guide to the Secret War will be the essential wartime reference for any Keeper or fan of the Cthulhu Mythos.
The project has a bunch of stretch goals that allow for full-color, hardcover versions of the campaign's Investigator's Guide and Keeper's Guide. Other expansions, such as The Guide to the Eastern Front are also teased.
As of this writing the project is at £7,725 of its initial £8,000 goal, so it's looking like we'll at least see the Call of Cthulhu version in softcover.