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Wait... I just checked that part of the video (9:35 or so) and the only character that's present but not available is Revali. I guess this is a mockup of how many character icons *could* fit in the available menu? That seems like a bit of a reach? I mean that could be totally accurate, with the portraits sized to fit that space; but I don't see any reason it couldn't also be more (say with a scrolling list) or (more likely, really) less.
Count the slots.
Looks a bit more like Vaati to me. Agahnim has an eye motif without a tail that served as the basis for both the Sheikah and Yiga emblems, but he's rather stout and wore bright, warm colors. Vaati has the red forehead gem and the generally purple color scheme. But I think it's more likely to be someone new.Agahim?