I think that's Cumberbatchs character on the inside of the glass, the color of the shirt matches the same color that hes wearing when hes sitting in the captains chair.
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Ha! And if thats the case have they already given away his death scene? In a reversal of Wrath of Khan it looks like Spock is the healthy one, the way he appears to be standing. It would also point to this being a kind of sympathetic villain that Spock would make this gesture for him.