Opera released version 12.01 which contains some recommended security updates. Information regarding security and stability enhancements for the various version are available here: Windows changelog, Mac changelog, Unix changelog.

[1] http://www.opera.com/docs/changelogs/windows/1201/
[2] http://www.opera.com/docs/changelogs/mac/1201/
[3] http://www.opera.com/docs/changelogs/unix/1201/
[4] https://ssl.opera.com:8062/desktopteam/blog/2012/08/01/opera-12-01-security-and-stability-release

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Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot edu