We now have the details on how to change a cookie setting to get the new Google Navigation Bar.
Maximilian Majewski posted the details on his Google Plus profile.
Here is it:
1. Go get this extension to change cookies. http://goo.gl/CeKtT
2. Load Google.com and right-click to edit the cookies.
3. Change “PREF” to this:
4. Don’t forget to save your changes at the bottom.
5. Reload and you have the new Google bar.