This beta continues to improve Apple’s new Safari View Controller,which will allow users to open web pages inside applications using full-blown Safari. The second beta adds a swipe gesture for dismissing the window that was previously absent. Developers including Tapbots for Tweetbot previously had to create workarounds for this behavior.
The update is available to registered developers via Settings > General > Software Update.
Developers can download the latest build by visiting the Mac App Store in the “Updates” tab.