Whoa! Don't go getting too excited folks, it's just a pic from a simulator - not an actual leaked OS or anything. In an effort once again to bring developers up to speed with the 5.0 OS platform, they have gone ahead and released the BlackBerry Storm simulator for everyone to download and play with. This one does come with 5.0 loaded on it so developers may put that to use to debug applications, and it should help create new ones considering all the new developer tools being made available.
While it was released for developers, this does not stop anyone from downloading it and poking around with it. Might want to check it out, especially if you have never installed a 5.0 OS onto your device. It's a great look at what's up and coming for it.