In an article by Graham CLULEY, comes an article that talks about a hactivist group called NullBulge. The apparent amount of data taken came from slack channels and is about 1.1TB in size.
The information taken could have come from at least 10,000 slack channels which contain messages, files, SSN data and more.
Disney will more than likely go after whoever hacked them as they have the resources to do so.
I’d say that this is preliminary, and nothing is known yet.
Feel free to read Graham’s article titled Disney hacked? NullBulge claims to have stolen 1.1 TB of data from internal Slack channels for more.