Twitter plans to roll out a new, re-engineered Twitter.com that provides an easier, faster, and richer experience - because "life doesn't always fit into 140 characters or less."
* New design - cleaner timeline, rich details pane and infinite scroll
* Media, easier to see embedded photos and videos
* Related content in a details pane
* Mini profiles can be seen when you click on a username
Read about the new enhancements at http://twitter.com/newtwitter
The changes will roll out as a preview over the next several weeks. During the preview, you'll be able to switch back and forth so you have time to grow accustomed to the way things work. Eventually, everyone will have the updated version.