I’ve been trying out the new Photoshop cs6 beta for a while, and so far it’s been great.
The most noticeable and most impressive upgrade to me, is the dark inferface. If you happen not to like it for some reason, it is possible to switch back to the light version.
The demo can be downloaded here http://labs.adobe.com/downloads/photoshopcs6.html
And you can read more about the beta here: