The Jelly Bean update also brings with it Blocking Mode, allowing you to disable incoming calls, notifications, alarms and LED notifications. A ticker on the bottom of the lock screen scrolls by with the latest information from your social networking sites. And for those who constantly go over their monthly data cap, the Android 4.1 update adds a calculator that lets you limit your data usage each month. And for first time smartphone buyers, Easy Mode makes setting up and using the Samsung Galaxy Express a snap with large home screen widgets available for the most widely used functions such as contacts, clocks and alarm, favorite contacts and favorite apps.
When the update is ready to be installed, users will receive a notification that it is ready to be installed. You can try to coax it out manually by going to Applications > Settings > About Device > Software Update > Check for Updates.
source: AT&T via Phonescoop