Nazi imagery is a big nein-nein in Germany, and the localized version of Wolfenstein was supposed to have removed all of it. A small swastika slipped through, and Activision is said to be recalling the game from shelves there.
The news, sourced back to 4players.de (translation) attributes a statement to Activision saying that "although it is not a conspicuous element in the normal game ... we have decided to take this game immediately from the German market."
Whether that means the content isn't in the game but is on the PC version for modders to exploit, or if it's a swastika as part of a background somewhere, who knows.
Planet Wolfenstein notes that the Wolfenstein teams from Endrant and Raven already have been laid off, putting a revised localization into doubt. Update: Raven's workforce reductions were across the board, not specifically targeting the Wolfenstein team.
Update: Via twitter, Kotaku reader Spunior pointed me back to one of the sites also linking to 4player.de. Schnitterbericht has a ton of screenshots showing differences in the U.S. and German versions of Wolfenstein. The final one (scroll alllllll the way down) shows a faint swastika at the bottom of a poster. If that really triggered a voluntary recall, Mein Gott in himmel!