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When will Yammer make the changes to their Java script API & Embed feeds?
Yammer plans to make the changes on April 6th, 2014. Once these changes have been applied, any On Premise CRM that does not apply the latest updates will no longer be able to use the Yammer integration.
What happens to my Yammer integration if I do not apply the latest updates?
How can I obtain the latest updates?
The fix for your Microsoft Dynamics CRM 2013 on-premises environment can be obtained from the link below with the release of Updated Rollup 2:
This information is also covered in KB 2956452.