on Wednesday released to developers the second external beta of its upcoming iOS 4.3, as well as a new pre-release copy of Apple TV software designed to support the mobile operating system’s new AirPlay feature for third-party programmers. It also informed developers that some features present in the initial beta won’t make it into the 4.3 release.

The first beta of iOS 4.3 introduced a personal hotspot control panel, new multitouch gestures for the iPad, and updated SMS alert settings. Resource files accompanying the release also provided hints at a handful of new iPad and iPhone models, as well as a potential “Find My Friends” social networking feature.