Apple releases OS X Mavericks Preview 4 to Developers via Software Update
Busting tweet us possibly not reach iOS 7 BETA 4 by the recent hack that was done on the Apple Developer Center, they released the fourth update of OS X Mavericks through Software Update.
Anyone with OS X Mavericks currently installed on their Mac, can upgrade using the Mac App Store specifically in the Software section.
By the time the Dev Center is down, do not know when Apple will restore the page. As for iOS BETA 4 , it has not appear on the iPhone (OTA) yet.