If they just started really investigating this a couple days ago, it's very unlikely they would even know answers to all the questions with absolute clarity. I would feel more assured if they said something like "we'll tell you everything we can, but there are many issues which will require a more thorough investigation before we can definitively say what happened".
It may take a day or two to craft a carefully worded press release. I would think it would take at least a couple weeks to do a really thorough investigation on a scam of this magnitude and scope.