Digital Trends – WWDC kicked off this morning and among the announcements, Apple introduced iOS 5. The new operating system is due for the iPad, iPhone 3GS and 4, as well as third- and fourth-generation iPod Touch this fall. iOS 5 addresses old customer complaints while also bringing some innovative surprises to the table, chief among which is its new Twitter integration. But the upgrade isnât all play and no work: Notifications, Mail, and Safari are just a sampling of Appleâs built-in apps that got a retouch. Hereâs everything you need to know about iOS 5.