Why exactly? The radio was reporting this morning that it would be unlikely for AHern to be arrested on a Friday because then he'd be in jail all weekend until courts started up again on Monday, so his lawyers would have been negotiating the time of arrest for him. Even more likely is that any warrant is meant to pressure Hernandez into talking/cooperating with the investigation so there's probably a bit of a cat and mouse game going on.
Its not about whether he will be arrested or not...that may very well still happen. Its about the incompetence of the media and how it is impossible to judge a situation based on their "sources".