I guess it depends on what you consider a 'fed.' Is a sysadmin at NASA a Fed? They are employed by the federal government...
Law enforcement--especially intelligence--is not going to be particularly well received this year. In the years I've attended, it's always a friendly sort of cat and mouse game. "You're the Fed, I'm the hacker, let's get a beer!" What with PRISM and domestic surveillance, though, I wouldn't be surprised if this was a serious effort by the con to reduce drama and distance itself from the intelligence and law enforcement communities.
Is General Alexander still keynoting Black Hat?