Thank you for reaching out to us again!
As the new law will come into effect in 2020, I'm sure that a lot of information will follow throughout this year.
Right now, I can only assume that the travel restrictions for people with a Duldung-status will also apply to people with a Beschäftigungsduldung: travelling abroad is not possible and you may need an exemption by Ausländerbehörde if you want to leave the country.
Here is a similar case answered by Thorgen:
Can I travel to Paris with my current 3-years Ausbildungsduldung status?
I hope this helps. Let us know if you have any more questions.
All the best,