Romney, and the RNC, are holding back until after the convention (Which is in two weeks by the way). After that, I look for them to come out of the gate with guns a blazing.
Exactly. Mitt is the presumtive nominee at this point. Once nominated he may have a reason to put more information out but until he is official why would he? Besides it is like the old joke "How do you keep a DUmmy in suspense?"

Let them eat themselves up wondering if there is anything concrete they can use against him.
As for Harry Reid, if he feels his honor has been challenged, let him challenge Priebus to a duel.
Who was it that said Harry made his money in gambling and prostitution?