While these Symbian Belle files seem to be the real deal, and the instructions are fairly simple, a quick glimpse through the comments reveals some users reporting problems with OVI Store, Skype, some widgets and so on. Symbian Belle brings the aging mobile OS in line with modern ones like iOS and Android visually - it has a pull-down notification bar, minimalistic signage with a back button, and so on.
Hit the link in the source if you are dying to try it out, but read everything carefully, since you might brick your device for good. Have a look at how the software looks and behaves on a Nokia N8 in the video below.
source: DailyMobileforum via Engadget