>>2989212It has to be Shinji. The hair color sort of gives it away, as well as the school uniform.
The close up of the glasses suggests that it's Gendo watching him, but who knows. They don't posses the red tint that's usually associated with them, but that could just be the lighting. Or maybe it's Mari, a character during the timeskip, or even Anno himself if this is supposed to be a parody or a joke, since Anno wears a very similar-looking pair.
The tank facility is nearly identical to Rei's "aquarium" that we've seen in 2.0 and 3.0, sans the color which has a heavy blue and white influence. The bigger question is why is Shinji clothed in his school outfit of all things if he really is the one in this tank? We do know that Gendo and Fuyutsuki were brainwashing Shinji in Rebuild for whatever reason and Shinji did have a number of lcl "blackouts" in the first two movies, so maybe this has something to do with that. Could even be after the ending events of 2.22, since that's the only account of him wearing his school uniform while piloting in movies.
On the other hand, seeing him a Rei-like aquarium like this is very telling. It adds further fuel to the fire that not only is he not human, but that he's something more than just an angel or a hybrid, but "special" like Rei herself. As if we didn't have enough clues and hints already. Almost makes me wonder if there's a batch of soulless Shinji clones being hidden somewhere, in case the occupied one is killed off or starts deteriorating... maybe in that Golgotha base that Kaji mentioned, but the we know nothing about aside that "dummyplugs" are created there.
This is all assuming that this isn't a teaser for another animator expo parody short or something, maybe we can finally expect to see some 3.0+1.0 information now at the very least, maybe even a teaser. Also, can anyone translate the Japanese kanji that appears at the very, very beginning of this teaser?