Just one day after its official unveiling, Apple has made iOS 4.3 Gold Master, build 8F190 (called it!) available to developers. The code adds support for mobile hotspot creation, third-party AirPlay access, along with a host of other improvements. The update is available to those with Apple Developer accounts and supports iPad, iPhone 4, iPhone 3GS, and the 3rd and 4th generation iPod touch models. Those of you with developer accounts, enjoy!