When you upgrade to timeline, you'll have seven days to review everything that appears on your timeline before anyone else can see it. You can also choose to publish your timeline at any time during the review period. If you decide to wait, your timeline will go live automatically after seven days. Your new timeline will replace your profile, but all your stories and photos will still be there. If you want to see how your timeline appears to other people, click the gear menu at the top of your timeline, and select "View As." You can choose to see how your timeline appears to a specific friend or the public.Read the details on Facebook's blog.
Facebook's Timeline is Here, Ready or Not
Facebook's Timeline is now live. You've got some time to opt-in before Facebook's converts your profile on its own.