Following the public release of tvOS 9.1.1 for the new Apple TV with the Podcasts app earlier this morning, Apple today seeded a second beta of OS X 10.11.4 El Capitan to members of its Apple Developer Program alongside iOS 9.3 beta 2, watchOS 2.2 beta 2 and tvOS 9.2 beta 2.
A standalone 10.11.4 beta 2 download should be available shortly via the Apple Developer Center and can be grabbed now through the Purchased tab in the Mac App Store on Macs with a prior beta.