Here's what else is coming, according to the Softies:
A new Yammer application in the Office Store (due out by the end of June). This app will allow customers to embed Yammer group feeds into SharePoint sites.
Improved email interoperability, making it easier for users to follow and participate in conversations across Yammer and email.
Enhanced real-time directed messaging.
SharePoint search integration.
Microsoft officials said today that the number of registered Yammer users has grown more than 55 percent in the past year, to nearly eight million. Microsoft also has taken a number of steps to increase Yammer usage inside Microsoft itself.