I don't think there is a smoking gun left to be "unveiled" in this case. This case is loaded with circumstantial evidence, much more so than other DP cases I have studied like Scott Peterson and Darlie Routier.
What we have to remember is that the case will have two separate parts, which the jury, who will all admit to being able to give the dealth penalty in jury selection will have to consider separately. They may not think of the DP when deciding on guilt and so on.
For the guilt phase, so far what I have seen from the defense is that they will try to create reasonable doubt using it could have been an accident theory. There are a few reasons this will not work- 1. CA will not admit to it being an accident so the jury will wonder why the defense is hinting at an accident yet the defendant will not confirm this. She also cannot take the stand, so how they would prove this is beyond me. 2. if it were an accident, in most jurisdictions, child abuse resulting in death, which negligence (pool accident) or reckless endangerment (chloroform in the trunk) would count as, carries the same sentencing and weight as first degree murder, so the SA can turn around and change the charges to get her there. The defense is backed into a hole with the accident theory as well as most of their theories. I am will to predict a guilty verdict.
Next is the penalty phase, where two factors are addressed: aggravating factors and mitigating factors. When the SA was thinking about whether or not to persue the DP, I am sure they looked at this. The aggravating factors are monumental- the 31 days, the duct tape, the lies to police, the riding around with the body in her car, on and on and on. Quite a large amount- (Compare to other DP cases like Scott Peterson!) But the mitigating circumstances- usually family and friends are quite low for casey. I don't think there are any friends will testify for her and her family has pretty much made their names and opinions mud with the public and any possible jury.
The final factor could have been the obstinant remarks by the family at the memorial or their behavior at the ZFG deposition. Why even worry about their feelings or think they can bring on mitigating factors.
If I were the SA, I would think this is a slam dunk case and the DP will follow.
They had to look at those pictures we have been shielded from. I think they believe that the only justice for Caylee would be in the DP.
JMHO.