Starting this morning, more and more users started seeing prompts on their home pages inviting them to switch over and try out the new Facebook. We're also really happy to say that anyone can try out the new site now by visiting http://www.new.facebook.com.
Over the past six months, 100,000 of you have offered to help improve the user experience on Facebook by giving your feedback and suggestions, and we're excited to show you what we've come up with. Here are some highlights:
The Wall now surfaces the most recent and relevant information—in the form of posts of stories—about you. We believe that having a constant stream of information, or "feed" is the most effective way to learn about and keep up with friends. Just as News Feed helps you know what is happening in your social circle, you can use the Wall as a way to give your friends the full story of what's happening with you.
Full Article - http://blog.facebook.com/blog.php?post=23612952130