There are already extensive features mentioned in CrackBerry which you can also refer to it but I will only cover what matters to me as a nominal BlackBerry user.
LOCKED SCREEN NOTIFICATION
Preview on your locked screen like your reminders, social media feeds, emails or latest BBM chat.
Setting up the section to see what really matters to you. Configure whose contacts or conversation you want them to appear in this Priority Hub. There are available settings already in place to automatically shift them here but you can customize who or who not to appear.
When you are in the BlackBerry Hub, you will notice there is Attachment view, this is the place where you can see all the attachments you received for all your email accounts, you can filter it by sorting it by sender, date, file name or type. There is also a quick search function you can use to narrow down exactly the name of the file.
ADAPTIVE SHARING MENU
Sharing your picture has never been easier when using BlackBerry with its ability to learn who or what app you usually use to share your picture, providing a shortcut right above the menu of apps you want to share to.
INSTANT PREVIEW AND REPLY
While you are doing your thing or surfing, new BBM message will drop down and you can tab the icon next to close to reply instantly without exiting your current app.
NEW COPY AND PASTE MENU
To me, this is the most important feature and massive improvement done for BlackBerry 10 OS. It is easier right now to copy and paste your texts from browser or emails. You can also opt to share it with any available app in the menu as well. To begin, you can just tap and hold it there for 1 seconds and you can drag the blue indicators left and right of the word to select your desired texts. The copy, paste and share menu will automatically pop up.
I for one don't really need multiple alarms but perhaps some of you guys might need it just in case you hit dismiss. I never know when I will ever use it but still it is a bonus feature.
You can simply tap at the top right hand corner as shown below to add another alarm.