Are you curious as to what Call of Duty looks like on current gen hardware versus next gen hardware? Here's an IGN video that should help.
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It's worth noting that the Xbox One is missing from this comparison footage—still, this should give you a general idea of what kinds of improvements next gen will bring, graphically. The differences aren't particularly pronounced, but if you care about detail, it seems like it might be worth waiting for next-gen releases.
Call of Duty: Ghosts - Current-Gen vs. Next-Gen [IGN]