Apple on Wednesday released a new build of iOS — version 4.3 beta 1 — that significantly expands AirPlay functionality for the iPhone, iPad and iPod touch. In current public builds of iOS, only native Apple applications can make use of AirPlay, which allows multimedia content to be streamed wirelessly from iOS devices and Mac computers to compatible hardware. In iOS 4.3 beta 1, developers of third-party native iOS apps and Web app developers can now utilize AirPlay functionality. iOS 4.3 is not expected to become available to the general public until March, giving developers plenty of time to implement AirPlay functionality into their apps.