During the AllThingsD D10 conference, Apple CEO Tim Cook said “stay tuned.” when asked about Facebook’s absence on iOS.

With WWDC less than two weeks away, we can’t help but to speculate that Facebook will get the iOS 5-Twitter treatment in iOS 6.

Now, according to a report from TechCrunch, the much-anticipated integration of Facebook will happen in “the latest version of iOS,” codenamed “Sundance“).

Facebook integration did appear in an iOS 4 beta build couple years ago. But didn’t go through and Apple instead went with Twitter as the main third-party authentication and sharing service in iOS 5. After Twitter and Apple joined forces for iOS 5 in Oct. 2011, Twitter experienced a 25 percent worldwide lift in service signups.

Twitter will still very much be a part of the new iOS (presumably named “iOS 6″)and the company will talk about it at WWDC including the integration into the forthcoming OS X Mountain Lion. But Facebook integration will be very important for iOS and Facebook — tons of apps use Facebook for sign-ups and authentication. Apple realized this and thought of formally bringing Facebook on board.

What does this mean for Facebook users.

According to sources familiar with the Facebook integration into iOS 6, the integration will be very similar to Twitter’s integration that launched with iOS 5. The integration’s biggest presence will be in the iOS Photos application. Like you are able to send photos to Twitter from the Photos application, you will be able to post photos to Facebook. A single sign-on section for all Facebook connected applications is present in the iOS 6 system settings application. Like with Twitter, a new “social sheet,” as some people familiar with the matter call it, will appear for an accompanying status message.

A second built-in advantage to Facebook integration could be the integration of the standard Facebook "Like" button on individual iPhone, iPad and iPod app pages, allowing a user to "like" an app and share it on their Facebook Timeline.

Separately, iTunes would have extra Facebook integration, according to the sources.

In February, Apple CEO Tim Cook told a group of investors that Facebook was “the one company that is closest to being like Apple”.

Facebook addicts may welcome Apple's change of heart toward the social network, especially if they can share photos and articles straight from their iPhones and iPads.

Watch Tim Cook speak at D10 here:

According to the company, the WWDC event, will be held between June 11 and June 15 in San Francisco, will kick off with a keynote address on that Monday at 10 a.m. PT.

In other iOS 6 news, last week there were reports about Apple putting final touches on redesigned iOS Maps application, which could include 3D capabilities. Google, however, might attract the limelight with its June 6 maps event.

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