Many Firewall/OSFirewall improvements stop more attacks, pass leak tests
Enhanced self-protection. More hardening and other self-protection added to withstand an onslaught of attacks ("stability under fire")
Early boot protection - new icon with a special tooltip now appears sooner during start-up (though security is active even before the icon shows).
Enhanced: Root-kit protection within OSFirewall blocks more threats
New daily credit monitoring - monitors your credit reports daily with email alerts and reports; notifies you if there have been changes because these are often an indication of identity theft.
Newly updated Identity Protection Center makes it easier for you to protect your identity in the physical world too.
Various antivirus and anti-spyware improvements.

Anti-virus: Scan modes added so you only scan what you need, increasing scan speed by 50% while still providing superior protection
Improved reboot time, login time, session start, UI loading, various other performance improvements throughout the product.

One-click Fix-it button lets you fix issues instantly
Improvements in Smart Defense: Millions of applications have security access automatically pre-set so the user doesn’t have to set them