Not wanting to raise hopes, but City would have a NDA in place for a transfer of this magnitude. Lessons will have been learnt from the Kaka deal about leaking stuff to the press (and we had an NDA there), and how the Italian media works. Whether we can control how Roma deal with it is questionable, but you can bet the terms of the NDA will be that things are kept quiet, maybe even by denying he is going.
Hypothetical scenario...
City use NDA
DDR says he wants to announce departure himself by addressing the fans
Roma keep quiet or deny he is leaving to throw off the scent.
I don't think it's too far fetched, but I could be clutching at straws.
I'd bet good money there's an NDA in place though.