Specific updates to headlights will likely only come when we re-do an entire model from the ground up.
To answer the other question on cabs, they are specifically made for what we have put them in. While you may be able to get something close to work in something else, we do not support it and you do so at your own risk.
If you are waiting for heritage units with cabs, I'd say you should just hold on for awhile.....it just might be in the works