Pre-registration rewards are headlining the freebies, and you can claim them even if you didn't register before the game's launch.
Other launch rewards include the Starpath Navigation giveaway, which will be available for 21 days after character creation.This is tied to the same mission and rewards page as the pre-registration giveaway, though it seems you'll also need to complete additional missions to earn points once you unlock this event. .
The Tower of Fantasy global launch patch notes warn of "many shortcomings" such as potential bugs. .