"This release includes several new features like Java Mission Control, Deployment Rule Set, support for Retina display on Mac, and Hard Float ABI support on Linux ARM v7. It also includes bug fixes and enhancements.
learn more (link to release notes page)

I assume Apple will be revising their support doc on Java updates available for OS X to reflect this update. If you have already installed Java 7 (update 25 was previous version), you can update via System Preferences ->Java Control panel. (I don't know if there's a Java 6 update in the works but as of Wed AM (9/11/2013), nothing later than Apple's "Java 6 Update 16" (actually Java 6 Update 51) showing in SU but that could change.)
   Java updates typically have important security patches but can break some software, so you may want to check with the dev/vendor of any java based software you depend on before updating and check for feedback. (Apple's OS X forums and/or forums for any java software you use. And of course always have a Backup.)

(BTW: See below for Intego blog post from Sept. 10th on recent new malware variant Java Applet.)
  

• Epson Printer Drivers v2.15.1 for OS X (is .1 a bugfix for previous problem?)
  (D/L page full set is 1GB. SU is smaller. If you're not having problems, I'd not update.)
• That Apple TV Refresh Is Coming Next Week
• Now Available: Metro Last Light OSX (Steam)
• Prevent OS X FileVault keys from being stored in standby mode
• New OS X Malware: Another Tibet Variant Found (via Java Applet)

• OS X: About the "Are you sure you want to open it?" alert (File Quarantine / Known Malware Detection)
  
  
• How to resume interrupted iTunes Store downloads
• Using the iTunes Store for iPhone, iPad, and iPod touch
• iTunes: Sync purchased HD videos to iPod or iOS device
• iTunes for Windows XP: Troubleshooting video playback

Tuesday Sept. 10th, 2013 News Archive
• Microsoft Office for Mac 2011 14.3.7 Update (info on security/fixes)
• Team Fortress 2 Update Released with OS X crash fix
• Steam Client Update Released (includes OS X/Nvidia fixes)
• iTunes radio (coming soon)
• Mac mini transition week 3
• Apple Support/How-To/Troubleshooting Article Updates:
  - iMac: Fans run at full speed after computer turns on
  - Bluetooth: How to set up your Apple Wireless Mouse or Magic Trackpad
  - Vintage and obsolete products
  - iCloud: Troubleshooting missing content after a restore
  - Adobe Flash Player updates available for OS X on Sept 10, 2013
  - OS X Lion: About Auto Save and Versions
  - OS X: Taking pictures of your screen
  - Exams for Service Technicians
  - Accessing Pearson VUE Service Exams
  - Apple Service Training and Certification FAQ
  - iPhone: Wireless carrier support and features
  - Cards: Frequently asked questions (iOS app service ended)
  - How to rent a movie from the iTunes Store on Apple TV
  - iTunes: Sending iTunes Gifts
  - iTunes Store: Writing a review
  - iTunes Store: Download times will vary

For links to older news pages, see the Archives.