We can edit a Chatter Post after posting
Super cool Lightning App Builder
In the Page Layout you can add Actions in the Salesforce1 Action Bar
New option to enable Middle Names and Suffix for Person Names available
We can deactivate Flow and Pb's without waiting 12hrs
Updating only a subset of child records using Process Builder
Enhancement in Flow unhandled fault email
User Provisioning Object is available to build your logic around it
Omni channel is available with a quick start implementation guide
You can define Live-agent blocking rules (based on Ip address)
When you create a new object you can expose it in chatter group with the help of new option 'Allow in Chatter Groups'
Recent Tabs is replaced with history console component where you have bookmarks exposed as a tab
More to come...