I love this thread!
For those of you having trouble testing the flashing LED when pinging your iPhone, it appears the iPhone must be locked for this to work.
Here are a bunch of smaller things I've noticed (some may have been obvious to others!):
General
- You can side from the left side of the screen to the right to go back to the previous menu, just like iOS.
Camera Remote app
- If flash is enabled, and you use the 3 second timer button on your watch, your phone will take a single picture.
- If flash is not enabled, your phone will take a burst of 10-11 photos.
(I'm using an iPhone 6 Plus, so I assume only phones that support burst mode do this (5S+). Can anyone speak to the behavior when using this with a 5 or 5C?)
- You cannot start a video recording with your watch, however you can end a recording that was first started on the phone.
Weather app
- Tapping the info dial will cycle the displayed data between weather conditions, temperature, and rain percentage. Force Touching the display also gives these options.
Passbook app
- When viewing a QR code for a pass, everything else on the screen will fade out and the watch display will brighten to make it as easy as possible for scanners to read the code.
Siri
- Siri on the Watch will sometimes ask to Handoff a task to Siri on the iPhone.
- You can't web search directly on the Watch, but you CAN ask for an image search. For example, "Show me pictures of corgi puppies" shows 10 results from Bing.
Stopwatch app
- You can Force Touch anywhere in the app to choose from 4 different styles.
- Swiping up from the bottom of the display while in the Analog style changes the view to one similar to the Hybrid style. Tapping anywhere returns to original view.
Now Playing Glance
- Similar to iOS, tapping the song name in the Now Playing glance will bring you to the app that's playing it, if there is one on your Watch (Music app, Pandora, etc).
Messages
- Also like iOS, swiping message bubbles to the left reveals the times they were sent/received.