Two weeks ago iOS 5 beta 5 was released and now Apple registered developers can download iOS 5 beta 6 via iOS Dev Center that works for iPhone 4, 3GS, iPod Touch 4G, 3G, iPad 2, and iPad 1.
In July Apple unveiled iOS 5 beta 1 to developers at WWDC 2011, with more than 200 new features and also announced the final iOS 5 launch to general public in fall 2011 with the release of new iPhone.