{UPDATE}
iOS 6 WILL be Released at WWDC. Banners are being hung at the site of WWDC 2012 that explain what will be talked about. This is one of the pictures:
As WWDC 2012 is nearing, many new rumors are popping up, mainly about iOS6. Apple has now started releasing iOS previews at WWDC sense they have not been able to release the iPhone. The iOS discussion is getting heated, and we will see how it turns out. The current rumors are as follows:
Notifications Center
Notifications Center might be getting a new feature with iOS6. 9 to 5 Mac Reports that iOS6 may bring a "Do Not Disturb" Feature to Notifications Center. This feature would allow the user to shut off all incoming notifications temporarily. This would be helpful if someone really needed to concentrate and couldn't be interrupted. When "Do Not Disturb" is turned off, it should reenable the Notifications, and hopefully send the notifications that Pinged in during the time in which "Do Not Disturb" was enabled.
iCloud iTabs
Apple may very well add a new iCloud feature into iOS6; Safari Synced Tabs. A User will be able to start viewing a website on one iCloud Device and be able to pick it up on another Device. This may make browsing easier, but it might also make it a pain as all of your tabs remain open on ALL of your devices.
Apple iMaps
All Previous iOS Versions have had a Google Maps Powered Maps Application. Supposedly, with iOS6 Apple will Scrap the Google Maps Interface and build their own interface. The Apple iMaps Application might include 3D Map Features Interlaid on a Traditional Map.
Facebook Integration
Apple may soon Integrate Facebook with iOS, similar to how they integrated Twitter. Tim Cook Hinted about it...
Siri... On a New Device
Siri may very well be coming to a new iDevice! People have been waiting for Siri to come to the iPad, and iOS6 may be its chance. There is not much more about Siri on the iPad...
Mail iVIPs
The Mail Application in iOS6 may allow the user to set certain people in their Contacts List as VIPs. All Mail received that was sent from a VIP Contact will be starred, so that the user will easily be able to find the messages from that person. This would be helpful for people who get a lot of junk mail, or just a lot of mail in general.
Thats all for now, but this post may be updated later.