* Plug-ins run in their own process, so if they crash, Opera keeps singing.
* Giddy-up: Opera 12 receives a significant speed boost — faster page loading, faster start up and faster HTML5 rendering — over its predecessor. 64-bit support on Windows and Mac gives better performance on more advanced machines.
* Right-to-left text support and five new languages: Arabic, Persian, Hebrew, Urdu and Kazakh. Opera 12 now comes in 60 total languages.
source:http://linuxpoison.blogspot.com/2012/07/135781677512186.html