Apple already released iOS 5 Beta 5, which means that the official version will be released soon. After the break you can see some nice information and stats about the iOS Beta versions since 2008.

• iOS 5 Beta 5 will expire on September 14th.
• The 6th Beta Version of iOS 5 will be released 17 August.
• Normally Apple releases 5 or 6 Beta versions before its official release.
• Apple released 8 beta versions before Apple released the official iOS 2. iOS 2 has been announced on 6 March 2008 and has been released for iPhone users on 11 July 2008
• iOS 3 has been released after 5 Beta versions. It has been announced on 17 March 2009 en has been released on 17 July 2009.
• After just 4 versions Apple made iOS 4 available to the public. Announced on April 8 2010, Released 21 June 2010.
• iOS 5 has been announced on June 6 2011. Apple Released 5 Beta version till now, and will be released on….?

Source [iPhone-Ticker via iPhoneclub]