I was ready to hate on this as just another Slack clone, but its unique features (actions and decisions) sound pretty great. Those combined with the Focus Mode sound like what Slack needs to have, to be honest.
I am putting my hope into Slack cloning this feature similar to how facebook cloned g+ circles or snapchat. Hopefully it will be usable and not like they added "Threads".
Slack is just another IRC clone anyway... :-)
And cellphones are just a clone of Marconi's radio.
Actions appears to be the only new thing; Decisions looks just like pinning a specific message in Slack based on the screenshots.