One of the bigger changes in iOS 10 is the raise to wake feature, which wakes the iPhone as soon as you lift it up. Along with this change, Apple made it so you have to press the Home button to open your iPhone from the Lock Screen, which is a bit annoying when you aren't used to it. If you want to go back to simply resting your thumb on the Home button to unlock it, head to Settings -> General -> Accessibility -> Home Button and toggle on "Rest finger to open." You will, of course, have to have your Touch ID configured for this to work.
iOS 10 brings quite a few changes to the iPhone's Lock Screen, including raise to wake, rich notifications and widgets among others. Whereas widgets were only available in Notifications in previous iOS versions, they are now available in the Spotlight screen, which is accessible from both your Lock Screen and Home Screen.
While many of us install iOS public betas just to use all of the new features before the official launch, Apple's Beta Program is intended to help them discover and fix issues with the new operating system. Putting it in the public's hands is a powerful tool to help identify issues. If you have installed the public beta (if you haven't here's how) and are noticing bugs that should be reported, or just want to make suggestions, there is a Feedback app that will allow you to do so. Here's how to use it:
Apple added Haptic feedback to the Sleep/Wake button and Ring/Silent switch in iOS 10. This has replaced the vibration sound and sound your iPhone made when you put it to sleep using the Sleep/Wake button. There doesn't seem to be a way to bring back the old sounds, but you can disable the new Lock Sounds in the Settings app. Just navigate to Settings > Sounds and scroll down to the bottom of the page, then tap the Lock Sounds slider so it is OFF/WHITE. This will disable the Haptic feedback vibration your phone makes when you put it to sleep/lock it using the Sleep/Wake button.
Apple seeded the third iOS 10 beta to developers this morning after releasing several new updates on Monday, including iOS 9.3.3, watchOS 2.2.2, OS X El Capitan 10.11 and tvOS 9.2.2. Today's update contains mostly bug fixes and other improvements, but it also includes a few new tweaks and features.