Diablo 3 has gone through 24 Seasons since the concept was introduced in August 2014, but the creation of Themed Seasons starting with Season 14 in August 2018 gave them a new style of gameplay.
Diablo 3 Season 23 began on April 2 to some notoriety — namely its lack of a (dedicated) theme.
While Diablo 3's Season 23 does not have a theme, it does have updates to the follower system that will apply to both Seasonal and non-Seasonal play.
It's official: Diablo 3 Season 23 will start on April 2, just five days after Season 22 ends on March 28. While a rapid turnaround, this falls in line with how the Diablo team has handled longer seasons — like Season 22 — by leaving a very short gap between Seasons. I'd predicted either April 2 or April 9 launch for Season 23, and while I though we'd get the full 12 day break between Seasons, it turned out that Blizzard wants to get the Season to us sooner.