Apple as released iOS 11.3 beta 4, along with new betas for Xcode 9.3, macOS 10.13.4 and tvOS 11.3 as well. Here’s what is available for download for developers:

Xcode 9.3 beta 4 (9Q127n)
macOS 10.13.4 beta 4 (17E170c)
iOS 11.3 beta 4 (15E5201e)
tvOS 11.3 beta 4 (15L5198d)

A new fourth beta for watchOS 4.3 should follow shortly, as its release was out one day after the third beta releases of the software noted above.

No word on what’s new yet, but stay tuned. We’re getting close to the final public release of iOS 11.3, which includes Apple’s Battery Health (beta) feature, new Animojis for iPhone X and updates to ARKit.