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Getting a modern [clean] diesel to work in a hybrid application will be difficult, given the start/stop nature of a hybrid. Diesel aftertreatment systems need frequent steady state operation to be able to regenerate the DPF. Stop/Start city operation would soot load a DPF pretty quick, making a run out to the highway for a "burn" necessary every few days.
If you go on VW forums, the general consensus is that any commute less than 7 miles spells trouble for a clean diesel, and that's lightly loaded stop and go, not stop/start which will mean even lower EGTs and less regeneration opportunity.
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