Not really. Science magazine did a profile of USAMRIID a few weeks ago which mentioned some of the related incidents, like the Camel Club thing, and it sounded like a big nothing. You can also tell it's a big nothing because of the ridiculousness of some of the innuendos, like that story about someone rolling back the meter on an electron microscope they were supposedly using to look at anthrax (LOL!). Greendale School revisited, in other words.
So, it's the same kind of deal as with Hatfill, where agenda-driven people construct their own fantasies out of a few half-baked rumors, and like the Hatfill thing, it will whither in the light of day. It differs from the Hatfill thing in that some relatively high profile people were willing to point a finger at Hatfill (Rosenberg, Kristof), whereas nobody with any kind of inside contacts or any real scientific or journalistic reputation to maintain has gone on record against Zack.
Once the Hatfill thing plays out, the air will be completely out of the "rogue government scientist" balloon. Nobody's going to revive that Frankenstein monster after it's dead. Everything is going exactly according to plan.