I could have sworn they showed it was dropped to a 60w in the keynote but the tech specs section on the website says 85w. Either way the 85w would work because the tech articles in the support section says you can use a 85w MBP to charge a 60w MB.
I have one from an old MBP that was replaced under warranty so I hope they are the same. According to the tech specs under the mac section of apple.com they should be the same.