Apple released the third beta of macOS Mojave this evening.
Apple has only released the third beta of macOS Mojave 10.14.4 in the developer betas area. The next beta round of iOS 12.2, watchOS 5.2 and tvOS 12.2 is pending until further notice. The last release took place on February 4th. It is assumed that Apple will submit the said betas shortly. The new macOS 10.14.4 offers, among other things, support for smart TVs in Apple's Home app, Apple News in Canada - for the first time with bilingual support, French and English, as well as other changes.
The build numbers of the current software versions are:
macOS Mojave 10.14.4 beta 3 (18E194d)
iOS 12.2 beta 2 (16E5191d)
tvOS 12.2 beta 2 (16L5191d)
watchOS 5.2 beta 2 (16T5191d)
Xcode 10.2 beta 2 (10P91b)
Xcode 10.1 (10B61)
iOS 12.1.4 (16D57)
tvOS 12.1.2 (16K534)
watchOS 5.1.3 (16S535)
macOS Mojave 10.14.3 (18D109)