I found a related question in a "Whats new in 2017.3" doc which may assist a small amount.
Q: Is the new UI an update of the current "mobile UI" or separate layout? Are changes within the mobile UI kept?
A: Yes; the Responsive UI updates are updates to the current UI (known as the Self Service Mobile UI). Changes customers have made are maintained.
I receive confirmation from Ivanti that that the Mobile Self Service interface will continue to be developed and improved on and this look and feel will also start
being used in the rest of the product starting next year.