This landing page is exceedingly light on explaining what problem they solve for me.
This is a great opportunity to be an Atlassian competitor. I'm sure more than one business added Atlassian cloud services as a business risk in the meantime, even if they weren't affected.
gitlab seems to be eating their lunch already. Its bit bucket plus Jenkins plus the best bits of jira and it's starting price is free... I like confluence a lot, but separate design/documentation tools with their files pushed up to the repo are good enough. Latex, doxygen, or PowerPoint, whatever you want.