It is true, Elder Scrolls Online is preparing to run a bonus event from April 24th through the 30th. During this period, players will earn one free crown crate every day just by logging in to the game. If you’re faithful to do this for the full run, that nets you six free crates (which may hold cosmetics, boosters, mounts, and skins).
In addition, ZeniMax is offering a free week trial of ESO Plus to see if you like the benefits that a subscription brings to the table (although it should be noted that trial users will not get a monthly stipend of free crowns). The trial can be found under the “featured” section of the crown store.