The update weighs in at 117MB and includes a lockscreen notification preview, and a Priority Hub that flags certain messages. If one delay has thrown your entire schedule off, "I will be late" will send out emails to those names in the calendar you have appointments with for the day, alerting them that you will be late. Already found in other platforms, "Reply Now" allows you to automatically send a message to a person whose calls you are ignoring.
Among other features coming in BlackBerry 10.2 is the ability to set multiple alarms, and the ability to send group SMS messages. Also, there are improvements to the browser and the camera. With BlackBerry 10.2 pre-installed on the BlackBerry Z30, it should start rolling out to more countries soon.