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The game will be historically accurate and since the X-4 was never actually used during World War II nor officially delivered to the Luftwaffe, I'd say it's safe to assume it won't be implemented. I'm not a developer though, so I could be wrong (its happened before!).
 
The fact this discussion is still ongoing blows my mind. MadMat already said no Wunderwaffe, so unless you can find documents proving a weapons system was in use in Normandy in timeframe (like I did with the M18) or that it was in the TO&E of a unit in Normandy and simply not used (like the M22 Locust) this is just pointless and baseless obsession.