Read on below for official patch notes for update version 1.5.0: You can now select Chinese (Traditional), Chinese (Simplified), or Korean in the language settings menu on the Switch console to display text in... (video-games-galore.com)
The developer's official patch notes don't go into much detail about how the PS4 Pro will be supported, writing only that version 1.11 of Dark Souls 3 will see «Increased frame rate for gameplay on PlayStation 4 Pro.» (polygon.com)
Full official patch notes from Take - Two Interactive Software, 2K, and Firaxis Games can be found here. (ticgn.com)