Well....to be honest, I don't know the specific details with the Opeth thing.
On the Dream Theater and Mike Portnoy forums, they had released radio single versions of "Panick Attack" and "These Walls," but no promos. So they were trying to enforce that you could discuss those two songs, but nothing else about the rest of the album, because that was the leak. Personally, I thought they should have shut down the forum half a month earlier if they didn't want people talking, otherwise what is the forum for except extra work for the moderators?