Google has confirmed that they are rolling out another visual update that would remove the top navigation bar from all their services.
Google services would now be accessible from the Google logo. Options would appear on mouse hover. We are not sure how this would work on Tablets though.
Google Plus related options and the settings dropdown would appear on the right side of the search box on different services. Google has ensured that the positioning would remain same throughout their network.
We are not yet seeing this updated interface at our end but it should start appearing on your accounts in the coming days.