@David ***********
Well, I'm not due for renewal yet. That comes next year. I was wondering if anyone's been through the process because if it turns out they're only handing out 2 year licenses, I might as well stick to my marriage visa because on that you can get a 5-year license.
As I hold multiple passports/citizenships, another option would be to go to my LTD and find out. If it's a no, I'd go out for a marriage visa (90 day one is probably enough) on a different passport and fly back to extend the license then leave again, switch passports and resume using my DTV. Might sound a bit convoluted but it really isn't.
Chances are, that probably won't be necessary but many people have stated that the DTV is treated as little more than a tourist visa despite it's long validity.