I have been wondering the same as well. I have not seen any updates and not even an upgrade release in a couple years. I find in particular the Precision Contrast and the Precision Detail tools to be extremely useful. The AI Clear also has come in quite handy.
I have been wondering if the same is true of the Adjust AI product as well.
When I first was introduced to Topaz Labs, they were basically a PS plug in company. Then the decided to start bundling their plugins into Topaz Studio with improvements in the tools and adding creative tools with it. Now it seems they are abandoning all of that and going back to a couple standalone/plugin apps.
It would be nice to get some definitive answer from the Topaz folks on their direction.