"Investigating - Bitbucket is returning 500 errors for SSH, Git via HTTPS, API and it's Website. The team is currently investigating the issue. "
see: status.bitbucket.org
Looks to be back up: "Monitoring - The issue is resolved and Bitbucket is operating normally again. The team will continue monitoring to make sure it remains stable." Jul 19, 20:07 UTC
Significantly faster time to recovery than most Github/Assembla outages I've experienced.