This info was just leaked on the twitterverse.
I was honestly really hoping for a copy of Fallout 4. At least that will be one of the few exotics no one has Xurned still.
EDIT: Lord Malak has reminded me that Xur will also be selling the Illuminati engram.
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Im just gonna say it, Knights of the Old Repuplic 1 and 2 are the best games ever!