Yep, I'm sure Cuban would love to talk about it, but he could get in legal hot-water depending on what he says. (In fact, I'm surprised he said anything.)
It was a lawyer-vetted statement in response to media stories about him. Mark had to post something on his blog so he did not look like he was avoiding the issue, nor give the false impression that an elaborate explanation was coming.
There was a recent article that said the best way to stop a rumor was to directly address the allegations, regardless of how trivial a rumor was. If that is true, Cuban would have been more effectice if he simply stated that the prosecution would have to prove in court that he did anything wrong, and that he is glad to finally get the chance to settle the matter. Instead, he attacked the prosecutor's motives several times, and denied it only as a last remark. Therefore, it is not surprising that he is getting all this attention.