Apple has dropped beta versions of iOS 18.6, macOS 15.6, and other operating systems, likely the final updates before the major iOS 26 launch.
These releases primarily concentrate on resolving bugs and improving overall system performance and stability.
Don't expect many flashy new features; this is about polishing the current software before the big fall release.
While these betas should be fairly stable, remember they're still in testing, so you might encounter some unexpected issues.