I introduced the Flat UI Free (TR) 2 months ago. Today, Its Pro version (FLAT UI Pro) released. I assumed it will be released next month. The project I’m working on is built with Twitter Bootstrap. That’s why I have been planning it will be easy to convert the UI to Flat UI Pro. I’m going to start improving the user interface and fixing the rest issues in next month. So, I can demonstrate a beautiful Flat UI Pro usage soon ;)
You can see the features from http://designmodo.com/flat/ and download for $39.