The discovery is deep into the how-side of the chemistry and genetics involved.
Upshot is we now know enough about how some bacterial sensors, for like pH and CO2, work that we can alter how that chain of events works. We will soon be able to customize any of the sensors and its corresponding DNA switch/dial.
And, of course, we are already into fiddling with bacterial DNA big time. So now we have the ability to customize a sensor grid around any bacteria to activate DNA of our choosing, natural or artificial.