Facebook maybe working on a Facebook Phone, but iOS 6 has super tight Facebook Integration.
Apple just announced tight integration with Facebook in iOS 6 making the iPhone the Facebook phone everybody seems to want. The iOS 6 Facebook integration brings Facebook contact sync as well as Like buttons almost everywhere. I am not sure if I particularly like this new feature.
Apple has announced many more iOS 6 features that are actually very useful like Do Not Disturb.
The WWDC 2012 keynote is still ongoing. Via Engadget Apple WWDC 2012 Live Blog.