This is what the answer I got from MTH.
"Thank you for contacting MTH Electric Trains. We appreciate your interest in our products. While the initial app will not allow you to run the TMCC engines another version that will be coming out in the first quarter of next year will have this capability. Please let me know if you have any questions or if there is anything else I can help you with.
Thank you,
Kirstin Martinez
MTH Electric Trains"