[kuschku]

Prometheus is finished, production on the prototype has started, and the first flights of the prototype are expected in 2020.

If Arianespace follows that schedule, they’ll be a decade late compared to SpaceX, but still ahead of all other competitors in this.

[agildehaus]

There's no flight scheduled. They're developing a full-scale article to be ground-tested in 2020.

Prometheus or not, Ariane 6 is an expendable rocket in any form that currently or will soon exist. By the time they figure out the very basics of first-stage reusability on a launcher that is roughly equivalent to Falcon 9 FT, SpaceX will have BFR ... likely for quite a while.

At least their reusability plans are not a joke like ULA.