Honestly, the only issue I have with DLC exclusives is the time delay for the things that will eventually come to Xbox.
Most instances there's a 3-6 month difference. Though it seems as if we might be seeing a 9-14 month difference on this.
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Then they'll probably charge us for the extra stuff too.
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If Activision has control of the DLC, it won't be an extra charge. Typically with how COD worked, any exclusives ended up in X, Y, or Z map pack down the road. I don't foresee any additional charges in Xbox DLC due to this fact.