Baker, this news appears to be real.
It's over 500 GB of data uncompressed (~100 GB compressed)
@DDOSecrets obtained the data related to a London company, Formations House, at address 29 Harley Street.
They provided the data to some news organizations a while ago (pic, https://twitter.com/UR_Ninja/status/1202029571656302595)
and will now start publishing their analysis under hastag "#29Leaks"
From one article (occrp):
"What do a Swedish Hells Angels boss, an Iranian state oil company, the Italian mob, and a fake Gambian bank have in common? The answer: A company services firm called Formations House, hidden behind the doors of one of London’s most exclusive addresses."
Leak is considered larger (and more open/accessible) than the Panama Papers, even though it might still be unclear what entities/countries are involved when all data is analyzed.
some sources:
https://www.occrp.org/en/29leaks/
https://twitter.com/DDoSecrets/status/1202018718324277248
https://www.thetimes.co.uk/edition/news/global-web-of-firms-for-fraudsters-created-by-british-company-formations-house-5sb8zb238
https://www.transparency.org/news/pressrelease/29leaks_why_governments_shouldnt_rely_on_corporate_service_providers