Not likely
A congressional briefing of this kind isn't undertaken without the intelligence agencies knowing full well that some information is going to get out. The Bush administration could have worked out a "back room" deal without such a briefing.
There's a reason Congress and, to some extent, the public need to know about this. Not sure what it is, though.
I'm still surprised that Syria and North Korea conspiring to build nuclear weapons in Syria hasn't made more of a splash out there, though. Like Iran's nuclear program ("Oh, we quit that a long time ago. Really.") it's almost as though nobody really wants to hear it.
