Just far too many holes around that case. Especially around the "hard" evidence. So much procedural misconduct that that alone makes him deserve a new trial.
See, the only hole I keep coming back to is the one filled with charred bone fragments.
Do I think something fishy might have happened with the key and the car? Sure. The cross-exam of the cop regarding his radio conversation about the license plate of the Rav4 definitely seemed suspicious to me.
Still, while I'm not familiar with the case law in Wisconsin on the issue, I think generally speaking to get a new trial you need actual proof of prosecutorial misconduct, not just the implication of possible impropriety.
And what would a new trial accomplish, anyway? Avery's defense will still run into the same problem: Halbach's remains were found on his property, he was the last person seen with her, and he was the only person anywhere near the property that day who is known to have had some kind of connection to her.
Now that this documentary has come out and gained such a high profile, my guess is that any judge would be extremely hesitant to give Avery a new trial, because it would be very difficult to find a jury that hasn't already watched part or all of the documentary and formed conclusions about his guilt or innocence.
The documentary, in effect, is a protest from the defense team to raise their own profile and try to have their client found innocent in the public eye now that doing the same in a court of law is not really an option.