Considering that the DA threw everything but the kitchen sink at the Cosby case, a retrial would be either unlikely or unfruitful, given the judge's intentional leaking of juror's names to the press and hinging his judicial career on a guilty verdict prior to the trial, a second trial could result in legitimate claims of malicious prosecution, making any conviction easy to appeal and ultimately overturn by a higher court.
The only thing that we have right now is a mistrial based on a hung jury, no more, no less.
What the judge did (which I agree was despicable) and what the DA did (which doesn't matter) has no bearing on whether or not there will be a re-trial in 4 months. Cosby will appeal if he's convicted so from that point of view you could skip the trial entirely, his best bet is that he may be found not guilty.