Secret World Legends Announces Head Start Date - It Looks Like an Open Beta
The announcement confuses many people since Secret World Legends is a free to play MMO and it doesn't sell Founder's Pack. It's a big question mark for what exactly it is about. But according to MMORPG.com, who reached out to Funcom and got the answer that "this is for previous The Secret World players and those who signed up for the beta (application is still open)". So that looks like an open beta that allows all people to play the game before launch.
You can register an account at the official site if you want to play 3 days early.