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The only accessories that have been announced for the Lumia 920 so far have been the wireless charging pad, wireless charging stand, Fatboy wireless charging pillow and a couple of JBL NFC portable stereos. As of yet, there is no other word of any future accessories that may be announced.
I suppose if Nokia feels there is a market and need for an accessory such as the one you desire, then they will release one. You'll just have to keep your ears and eyes peeled . Have you managed to purchase a 920 yet? It's an awesome phone in my personal use of it