Characteristics of BlackBerry 10
So with BlackBerry 10 all buttons except power and volume are located in the touchscreen. You can do lots of things by swiping, and for certain commands you actually start moving your hand outside of the screen. If you've ever used Blackberry's Playbook this concept will be familiar. The Playbook OS is based on QNX just like BlackBerry 10 is.
The main characteristic of BlackBerry 10 is the fact that you can access everything by means of a swipe. There is very little layering inside the menus, so you won't find submenu after submenu here. The OS has been designed with multi-tasking and single-hand operation in mind. To make multi-tasking as efficient as possible, RIM has spent a lot of time and effort on what it calls BlackBerry Flow. It enables the smooth transitioning between apps, without having to leave an app entirely. For example, if you notice a new email arriving, by moving your thumb from left to right you can have a quick look. 'Peeking' is enabled by moving your thumb a quarter circle, starting below the screen. If it's nothing important, you can just keep working inside the app you were in.
BlackBerry Hub displays all of your communication (mails, messages, tweets, linked-in updates, and so on). You can access it with a single swipe. It reminds us of the Windows Phone approach.
When you're in an app, you can access all of the options of that app by moving your hand top to bottom, again starting outside of the screen. It's comparable to how it works on the Playbook. When you swipe from bottom to top you go to the start screen.