I noticed that the page fits better with white space around the left and the right side. In other words if you are using a bigger / wider screen the page will limit itself to a particular width which makes the Google Sign in page look much better as compared with the older one.
The New to Gmail and Create an Account links has now been shifted at the top and there is plenty of blank space below the Sign in Form. The content is the same and so are the links.
Google the search engine giant and provider of several services like email,advertising programs,social networking etc silently introduced new sign in page for their Google accounts.