Take over a friendly NPC upon your death, if you’ve managed to recruit any NPCs to your faction you are given an option to take over one of them in the event of your character’s death.
One of the patch note entries I’m super excited for - I know character swapping has been a debug feature for a couple years now while the mass of infrastructure work was done to decouple NPC’s from players. Has it also been properly introduced as an on-demand action? Swapping on death is a great first step, but swapping into control of the dedicated head of a strike team before setting off for a dangerous site would be even better - Some of us get really attached to our original survivor, and want to protect them 
Either way, I’m really excited for the prospects of higher lethality/dangers in the cataclysm. Decoupling death from game over really opens the options for mechanics like gunfights and top level horrors to be appropriately lethal. Dying to a lucky headshot and losing the entire save sucks, dying to a lucky headshot and swapping to the local second in command and finishing the firefight is a story you can tell, xcom style.
Edit: Aha, found it - wasn’t expecting it to be such an old PR, but looks like I’ll have to wait for experimentals to kick back up at least.