Elex 2 is now also listed on Steam and although it cannot be pre-ordered there, it can already be added to the wish list. The description says, among other things:

Several years after Jax defeated the Hybrid, a new threat arrives from the sky, unleashing the dangerous powers of dark Elex and endangering all life on the planet. In order to defend the peace on Magalan and the safety of his own family, Jax has to go on a mission to convince the factions to unite against the invaders and find his own son, Dex, who got separated from him … Dive into a huge, hand-crafted, completely unique world with multiple factions and diverse environments set in a post-apocalyptic science fantasy universe.

There is also talk of a release this year, which according to our forum was confirmed by a THQ Nordic employee on the official Discord.

Update: 2021 as the release date has disappeared from the Steam page and has been replaced by 'Coming soon'.