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I received the same letter, & my impression, which could be wrong, is that RC isn't taking new apps now because they're rethinking & restructuring their business. I wouldn't be surprised if they decided to simply pull the plug on this card.
The RevolutionCard never really took off I used my card exactly once - to get a $50 discount for new RC card holders in early 2008 - & never had a good reason to use it again. As I said elsewhere, the RC was the answer to a question that no one was asking.
I wouldn't waste my time reapplying.