The Spring Update that was scheduled for today (4/1) is now officially postponed for tomorrow (4/2), or until they can fix some bugs recently found.
Here is the official statement:
The Clan War League with new size and reward system that was scheduled to start today is also postponed for tomorrow.
In the meantime, a new event called "Town Hall Wrecking" was added to the game. Simply destroy five Town Halls to win a Book of Heroes!
For a complete walkthrough about the new Season Challenges and understand the Season Bank, Tiers, cost and how to unlock Hero Skins, check our Season Challenges guide.