This is not surprising at all. By the time iOS 5 is released we will have a new iPhone and the iPhone 4 will drop down the product line to be the cheaper option as the 3GS is now. As a result Apple wont even be selling the 3GS later this year.
As the post above me states other manufacturers dont even bother supporting older phone models once new software releases become available. Apple has given full support to the 3GS for nearly 2 years now.
iPhone 1 got 3 years of support. (1.x through 3.x)
iPhone 3G got 3 years of support. (2.x through 4.x)
Stopping 3GS at 4.x would only be 2 years of support, which is inconsistent with past practices.
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