The iPhone OS 4.0 beta 2 download is now available for iPhone developers along with the new iPhone SDK 4.0 beta 2 as well. The new iPhone OS 4.0 beta 2 firmware is supported on iPhone 3GS, iPhone 3G, iPod touch third generation, and iPod touch second generation. No new features have been discovered in the latest beta yet, because it's mainly bug fixes. I'll make a post if any new features are discovered.