Only the special dual logo sensors can be used to send an alert to the ADT monitoring center. Your other sensors can be used in exactly the same way as they currently work with your standard smartthings hub, for home automation routines.
See the FAQ ( this is a clickable link)
This question turns out to be more complicated then you would think. The new ADT/SmartThings security panel has two separate control silos, one for triggering calls to the ADT monitoring center and one for home automation rules.
Only the new devices which have both the ADT logo and the SmartThings logo on the box can be used with the new ADT/SmartThings security panel to trigger alerts to the ADT monitoring center. And those are the only devices that can trigger those alerts. Those devices are not using zwave. They are not using zigbee. They use their own proprietary protocol.
However, if you just want to set up home automation rules like turn the entryway light on if the contact sensor on the front door opens after sunset, then the new sensors will show up on your list of sensors when …