Can't have revolution all the time. Revolution then a period of evolution then revolution again. That's how the tech cycle works. Look at the iPhone, iPhone 3G and 3GS. Its been evolutionary and feature adding. One of these days, they need another revolution when the platform itself becomes old.
Revolution for the Blackberry world came with the Bold and the Storm. Every other model that follows after that was evolutionary, and will be for a while.
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