I thought that someone else would post this, but silence has made me decide to do it myself. I will not use Elliot's deadname instead of the name they just recently said is theirs, you should be able to pick up who they are from their previous roles as Shadowcat in X-Men 3, the star of Juno, Inception and most recently Vanya from The Umbrella Academy.
Their Twitter message is pretty long, and I don't really know how to well copy it to here other than copying what someone else reporting on it wrote, so I will just put the link bellow. They address not only who they are but systematic problems for trans people.
https://twitter.com/TheElliotPage/status/1333820783655837701/photo/1
Although a lot of people are reporting on Elliot as now being a man, I think that it worth noting that Elliot does not say what he is other than trans and what their pronouns are. Pronouns do not always always corelate gender, and they are distancing himself a bit from perceived femininity with "he/him", they also have "they/them" that would imply an element of non binary identity. So it seems that we have a pretty high profile star, who had made a bit of a name as an out lesbian, coming out as non binary.
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Through dream I travel, at lantern's call
To consume the flames of a kingdom's fall