Even though the new design had launched, any user which visited the site without logging in was greeted with the old design. That is no longer the case. See the screenshot below for what the new homepage looks like. Facebook still has a fair number of upgrades that need to take place as not all areas within the site take advantage of the wider design.
Update
We are now seeing the new design as well. The new design shift may now be final. We are waiting to hear confirmation from Facebook that the shift is complete.