Hey Lillian, here is a quick list of the things Yammer is working on (taken from http://roadmap.office.com)
-Yammer Added to O365 Management Activity API
-Yammer Group Administrator Onboarding
-Yammer Integration with Office 365 Groups
-Yammer Mobile Application Manager
-Yammer New User Onboarding Experience
-Yammer Profile Pic Synced to O365 Profile
-Yammer Skype for Business Integration
They'll be some big updates as we approach Ignite. Stay tuned!