Well nothing has gone wrong on my laptop so its time to update my main machine.
The feature that I have wanted to play with the most is the new Boundary Warp, when creating panoramas.
When shooting handheld you always get a lot of white space. This means cropping and loosing some of the shot. Now with the boundary warp you can get some of that back. There will be a lose of quality and its up to you to decide if its worthwhile for a particular shot, but its nice to have the option.