From the announcement at nmap-hackers:
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While the last release I posted to this list was 4.76 in September of
last year, we've had four beta releases since then with hundreds of
important and dramatic changes. I'm pretty happy with the latest
4.85BETA4 release, but more testing and feedback would help. Please
give it a try and report any issues or suggestions to
nmap-dev@insecure.org as described at
http://nmap.org/book/man-bugs.html.

4.85BETA4 (compared to 4.76) includes our new Ncat and Ndiff tools, a
ton of new NSE scripts for superior network discovery, more than 5,000
version detection signatures and nearly 2,000 OS fingerprints,
improved scan performance, and much more! You can read about all the
changes at http://nmap.org/changelog.html. Be sure to read all the
way down to 4.85BETA1, as that includes some of the most dramatic
changes.

Download Nmap 4.85BETA4 from: http://nmap.org/download.html

Thanks dude