As we know, the 3.0 looks to be devastatingly detail-packed. We're waiting on elaboration for many things, but already we can perhaps deduce that some of the elements will not be addressed in this film, if at all. This thread is for posting speculations about such details.
I will start things off by selecting a weird, inexplicable visual detail from the film (that I haven't yet seen for myself) and providing a possible explanation for it.
So, Eva-01 started some kind of Impact event that, according to Ritsuko, would destroy all old life in favor of something new. All of these glowing red Evas, along with the annihilation of the Tokyo-3 populace, might be connected: perhaps the Evas were new, "deified" bodies partially formed out of Angel goo (which is provided in abundance at such impacting events; cf. 2I). All of Tokyo-3's residents would have been reborn into them, had the process not been aborted. But because Eva-01 was stopped, this army of Evas simply lay in ruin like so many aborted fetuses.
No idea why they'd have armor from the start, but... whatever.
Probably wrong, but, hey, you never know.