From Slack:

Today Slack and Atlassian are taking even bigger steps to drive fundamental improvements to the experiences of hundreds of thousands of teams and millions of people around the world who use our products together every day. This partnership is about a joint vision of simplifying and automating the huge amount of effort that teams everywhere expend to stay aligned, coordinated, and productive.

I’m so happy about this. We switched from Slack to Hipchat about a year ago since we also use Jira and I’ve missed Slack ever since. After this news, we’ve already started the process of moving back to Slack. Woot.