Not true. Xbox players get it in a year, so its not "exclusive" to playstation.
Gran Turismo is exclusive to playstation, meaning xbox players will never get a release for it on their console.
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But will anyone still care in a year? By then they'll have lost most xbox players because we've already played all the content again and again and it's still a month or so until a very small dlc becomes available. I might as well spend the money on a new game instead really.