There are few GMAIL Features Added. "mail", "contacts" and "tasks" of Gmail are updated with new features. Google has updated by saying. Google is updating and adding new features after Microsoft Live Mail , Hotmail Wave 4 update
Gmail users will probably notice; mail, contacts and tasks are separate tabs at the top left of the screenshot. Another pretty obvious UI change is the compose mail button is no longer a text link. At the bottom left chat heading, we see call phone which is another new feature that could use Google Voice technology.