This applies to all platforms, worldwide. On Twitter, the official Battlefield account confirmed that hardcore servers will be available starting 4am PT today. However, hardcore servers haven't gone live just yet, as DICE likely wanted to stagger their release to make sure everything was going well with the core game after the fall patch. On top of a slew of fixes, feature updates, and balance changes, the patch also added in support for hardcore servers, a series staple. Original story: Battlefield 1 received a big patch yesterday. The Fog of War TDM variant also went live, just search for 'fog' in the server browser or use the matchmaking under 'custom'. Update: As promised, DICE has made hardcore servers accessible to players on all platforms.
Hardcore servers are now available to all in Battlefield 1.