I don't think its Itachi, now that I see it up close... Itachi's eyes are, naturally, black. Completely black. Once he activates the sharingan, they become red with three black dots - I don't see the black dots anywhere there. And if he activates the Mangekyou Sharingan the three dots combine into a shuriken-like shape...
Whomever that guy was, his eyes just didn't look like Itachi's.