New Twitter now is accessible by all users. "Whether you're just signing up today or you've been a user for years, this new experience is finally real for everyone -- all 160 million of you -- and in six languages to boot," said Twitter in the announcement post that "You can now dive deeper into a Tweet and see more details, like recent replies, the bios of other accounts mentioned in it, and photos and videos from media partners like Flickr, YouTube, USTREAM and yfrog."
"Not sure how to access the new Twitter? Check for the blue bar at the top of Twitter.com, and click on the yellow "Try it now!" button to give it a shot. You'll be able to switch between both the old and new versions of Twitter for the next few weeks. After that, everyone will just use the new version."
Watch this explanatory video:
Or, if you prefer a hip hop version, check out the fan video: