I'm pretty sure that they had a very, very small run of them late last year. However, with all the craziness over the past few months, they are probably using full production to keep up with their flagship models like the 44 bulldog and 38 undercover.
Have you tried emailing them? In my experience, the current Charter Arms is very responsive to emails and phone calls if they're relevant. I emailed them about the 45acp pitbull early last year when the 40s&w finally came out. All I was told is something to the effect of "it will be awhile," but the response was quick and if they do indeed have the necessary components/blueprints for the 9mm pitbull ready, you might get a more solid answer about a time frame for a full run.