The following is a highlight of some of the features and improvements:

 Nessus Engine

• Uses the same engine on Windows and Unix-based systems for a unified experience on all platforms and more consistent results
• Fully thread-based (as opposed to process based) for better scalability and reduced memory usage
• Performance improvements to reduce CPU usage on all platforms

 Port scanners

• Local and remote port scanners can now be combined. For example, if you select the Nessus SYN scanner and the netstat WMI portscanner , Nessus will try to log in via WMI to enumerate the ports first, then to fall back to the SYN scanner
• The TCP SYN port scanner has been rewritten entirely and operates the same between Windows and Unix-based systems
• Native UDP port scanner (ProfessionalFeed Only)

 Compliance Checking

• The database compliance checks can now log into MSSQL over SSL
• The PCI-DSS plugins are now fully supported

 NASL (Nessus Attack Scripting Language)

• Added support for Perl Compatible Regular Expressions (PCRE) to NASL
• NASL scripts can now share results between hosts via a global knowledgebase
• New NASL functions (XML parsing, the bignum library, new packet forgery functions, new socket-related functions and more)

 NessusClient

• Support for XLST transformations of the reports - This is one of the most exciting features and will be described in more detail in upcoming blog posts.
• The ability to export a .nessus file based on a filtered report
• Unlimited number of filters for the NessusClient on Windows and Unix-based systems

 Cross-Platform

• No external libraries are required, eliminating the need to tamper with your system configuration in /etc/ld.so.conf
• Added support for the newest Linux distributions (Debian 5, Fedora 10, etc.)
• New "linux-generic32" and "linux-generic64" builds for additional linux distributions
• 64-bit native builds of Nessus/NessusClient for FreeBSD, Windows and Linux
• All the Unix command-line tools (e.g., nessus-fetch, ’nessus’, nessuscmd) now also run on Windows