Hank Pym Is The Traitor!!
I really don't see how it could be anything other than this now, but if it is oh well. Mark Millar, if I'm correct you're a ****ing genius. If not, you've probably done something even better. Either way, you're mind****ing me up the ***!!
Theory:
Hank Pym hates Captain America for basically ruining his life. Not only did Captain America take Hank's place (and job) as the leader of the Ultimates after being uncovered in Iceland but he also humiliated him on more than one account and took his wife. So yeah, Hank does not like Captain America very much at all.
Hank Pym has mentioned before that he's on medication (when Cap's beating his ***) which indicates that he has some form of mental illness. Also, in the original universe, we know Hank Pym had a multiple personality disorder with his alternate ego being Yellowjacket.
Now, it is my belief in the Ultimates that the traitor is Hank Pym's alternate ego disquised as Captain America. How does this work? Well, we know that Pym has always had an infatuation w/being "the hero" that Cap is. And we know that he is bitter that Cap is the hero and deep down he probably wants to ruin Cap.
Now, I draw most of my evidence from issue #6, an issue I THOUGHT was just completely random and funny. However, once I began thinking about the possiblity of Hank Pym being the traitor, I realized how much it makes sense. For instance, I found it odd that they brought Hank back for an issue completely devoted to him after he hadn't even shown up for almost 3 issues (and was getting kicked off the team anyway). I believe this issue was not only for relief but also a way to personalize his character more and also tease you into thinking he was redeeming himself in some sort of pathetic way. Just like the scene where he is talking to Janet Pym and Cap comes over to threaten him. Later on in the issue, I found it interesting that his girlfriend asks him to dress up like Cap America. At first, I thought it was just a funny, ironic joke, but now I can see it as a major hint. He has a Cap costume You can see it lying on his bed in the 3rd panel of page 33, issue 6, vol. 2.
In addition, Hank is the only person who has spoken to the traitor. Could he just be talking to himself? I think that he believes that he is speaking to another member of the Ultimates. Perhaps he believes he is speaking with (and seeing)Tony Stark(or Loki, or Cap himself, some other Ult, really don't matter), whom would either be:
A)Hank's alternate ego as he pretends to dress up as Cap & frame him
B)convince Hank to dress up as Cap and frame him
C)if it's the Cap alternate ego, he just pretends he's Cap being the traitor
Either way, the Traitor is Hank Pym acting thru some f***ed up, hallucinating alter ego, which probably manifests itself through his hatred of Cap America and his own self-loathing. Hank's bad alter ego snitched on Banner. This bad alter ego went on to inform normal Pym of what was happening (thru hallucination or w/e goes on w/ these types of disorders) and normal decent Pym helps Banner escape.
This all goes to form the basic concept that Hank Pym is so obsessed w/ this "hero" idea that he goes on to form an imaginary conflict of good & evil in his head in which he, the conscious Hank, is the good guy and the bad guy in some shape or form is Captain America. He's so down & out that he constructs this elaborate plot in his head, starts acting it out, Loki catches on, adn all hell is unleashed.
I hope this made some sense. It's al lot to write and my wording could be totally screwing up the explanation.
I have no idea if this is what's going to happen, but I just don't see what else it could be. None of the other Ults seem to fit the traitor position entirely and any other reserve supersolder or w/e would just seem...well, not that schock inducing because we dont care as much about them.