Three additional, not mentioned in Tony's list:

1.      Localized strings for "Reset Thumbnails" <-- done last minute, needs more work, some translations may be incorrect. 

2.      Whatever the setting of Autosave in 26.0.1, the default value is now set to 1 minute after installing the 26.1 patch.

3.      When uncheck Autosave, after a crash and re-launch, the “Continue Editing” option will now be shown. 

"PS24 or 25 crashes when import/edit HEVC clip"

Not sure about a hotfix for earlier versions.  Discussing internally, to determine effort and risk.