I think you may be on to something here. Trump didn't get to where he is by foolishly rushing into things without having a good idea of how he was going to prevail. It does make sense that he has the information already and is simply making sure that the media and the public are paying close attention when he discloses it.
Like most real estate developers, he has a strong legal contingent around him and they not only make sure his homework is done, their Rolodexes are loaded with the phone #'s of the best 'investigators' to help get it done (particularly as it pertains to chasing down the personal details of Obama's shady life).