Recently, Microsoft filed a patent for Rich Notifications in computing devices. In the Rich Notifications system, you will be able to get more information about the notifications from different apps without leaving your lock screen.
When you tap or perform any other gesture on the missed call notification on the lockscreen, you will be able to see the actual details of the missed call. Similarly, if you tap the email notification, you will be able to read the subject lines of the e-mails you received. When you again tap these notifications, you will be taken to the corresponding apps for performing actions.