Google Apps For Education and Google Apps For Business can choose to release new features for their users in one of two ways:
1) Rapid Release - New features are available to users within your domain as soon as Google releases them.
2) Scheduled Release - New features are available one to two weeks after Google releases them, which allows schools to learn about the new features, train staff, and introduce them.
Where can you find this? In Dashboard, go to "Domain Settings," and look for "Choose how to release new features).