My TD doesn't really have many emissions controls on it aside from electronic injection, but from what I've read of the urea injection systems in both foreign and domestic "clean diesel" vehicles, the holding tank (it is a liquid solution injected after combustion) is heated. The refill rate, hence the holding tank, is supposed to be sized so they need re-fill @ recommended oil change intervals.
Most of these engine systems also use a catalytic converter and particulate trap in the exhaust system. The particulate traps (in the Fords at least) have been problematic as they go into "regen" often and use a fair amount of fuel to burn-off the soot. -Results in poor fuel economy (relatively speaking for a 7000+ lb truck).
Regarding biodiesel, the new Ford 6.7 coming out is advertised to be able to run up to B20, so I assume all systems are compatible.
Hopefully Mahindra has been taking notes, but I agree w/ Duluth, I'm fairly certain it will have urea injection.
-pete
