According to release notes, this update includes performance improvements and bug fixes, including the following:
- Siri
- Measuring stand activity
- Calculating calories for indoor cycling and rowing workouts
- Distance and pace during outdoor walk and run workouts
- Accessibility
- Third-party apps
It also enables display support for new emoji characters and additional language support for:
- Brazilian Portuguese
- Danish
- Dutch
- Swedish
- Russian
- Thai
- Turkish
Information about the security contents of the Watch OS 1.0.1 update should be added tothis Apple support document in due time.
As noted by Kirk McElhearn, who put a Fitbit One and his Apple Watch through their paces, Apple’s device isn’t a very accurate fitness tracker as it often would not count brisk walking as exercise and would report calorie measurements all over the place for indoor workouts.