Dragon ball fighter Z new Trailer and Beta Sign ups

Gamescon has release a new trailer for Dragon ball fighter Z that shows off Android 18(with 17), Android 16, Piccolo, and Krillian. Also it shows a glimpse of the story in dragon ball fighter z. Just what is going on here?

Also Sign up has begun for a limited beta that is available from September 16-17 with 4 3-hour time limit between those days. 

EU PS4 sign up: https://beta.software.eu.playstation.com/en-gb/dbfz
NA PS4 sign up: https://www.bandainamcoent.com/news/dragon-ball-fighterz-closed-beta-application
Xbox one users will need to sign up through the “Xbox insider Program”.