Developers just announced that Season 1 was planned to end in April, but has been extended to May 7, 2019 PDT in order to give the players more time to hit milestones and receive season rewards.
The beta season 1 item rewards are shown on the Season > Overview Page after clicking Season Rewards.
Seasonal rewards will be granted based on the Survivor Title held at the end of beta season 1. Beta season 1 rewards will be granted to players who hold the title of Novice or higher. You can receive multiple unique rewards and will be granted all rewards up to your highest title.
Rewards will be granted with the start of the new season, which will be announced at a later date. Rewards delivery will be completed within 1 day of the new season starting. If you have not successfully received your rewards 24 hours after the new season has begun, please contact Customer Support.
Any players who are found to have obtained a Survivor Title by violating operation policies may be subject to restriction and/or removal of seasonal rewards.