Is there a Sword Art Online/Accel World crossover?

Are there any crossovers of SAO and Accel World? Anime, manga, light-novel, anything?

I saw this image a long time ago somewhere:

Black Swordsman, Silver Crow, and Cartman

And I read about a possible crossover between the two. Does anyone know if it has aired yet or will be? And where I can find the episodes/chapters or find more information?

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