Here's a quick run video through with Adam Lerner:http://www.youtube.com/watch?v=Lv0a8aNgFhI
The editing features use a sub-set of the Lightroom Develop functions. You can also apply Lightroom Presets fairly easily, as Adam does in the video.
Much easier to use than most other editors, but also limited in functionality. A good place to start.
We will have to see if there is any interaction
with Lightrrom 4.0 and Photoshop CS 6.0 I haven't downloaded the Beta of Photoshop yet.