Merely because the substance of Hincapie's grand jury testimony was revealed to 60 Minutes does not mean that anyone committed a felony by revealing the information. A grand jury witness is free to reveal the substance of his own testimony; the bar on disclosure does not apply to the witness himself.
If Hincapie told a bunch of other people that he had been forced to admit that he and Lance both doped in front of the grand jury, one of those other people, without Hincapie's knowledge, may have spoken to 60 Minutes. That person would only be conveying what Hincapie said he testified to. He or she would not be revealing the substance of the testimony itself. In other words, the secrecy of the grand jury proceeding would have been pierced by the witness himself, which is not illegal. Once the witness reveals that information, you can't unring the bell; the information is out there in the public domain.
This would be fully consistent with Hincapie's statement, which was only that he didn't speak to CBS and that he has no idea how CBS got the information. This would be true if he doesn't know that one of his friends spilled the beans.
I'm only pointing out that Hincapie himself may have unwittingly been the source of that portion of the 60 Minutes report.