Be ready (practice, practice, practice) to give very specific examples of accomplishments - especially about people-related stuff. How have you dealt with conflict on your team? Have an example. How have you managed projects cross-functionally? Have an example. Etc. And make those examples into clear, concise stories that demonstrate that you have succeeded in a variety of situations that involved people at levels above you. Good luck!
Be willing to take the heat, most importantly for your people, and you won't need to worry about being a manager. And when it might seem that they won't do it your way or it will never turn out as good, you'll experience the magic of taking risks, delegating, and challenging others to grow - leading as opposed to managing. Once your people love you, you will be unstoppable and it's off to bigger and better things, internally or externally.
Thanks for the pointers, folks! A whole new world!
use the words 'mentor', 'collaborate' and 'cooperate' frequently in the interview :)