Mixed worgen group

[Buetzel]

you have to do the initial quests, i think, to get your talent points. also i'm not sure about being friendly with the alliance without doing that shame-run to varian after the light's hope event.
my guess would be that porting him out of the starter zone is blocked. would make sense, i guess. lorewise the dk is still evil and under arthas' reign before he has done all the starter quests.

on the other hand - you could just try it out. if it doesn't work and your dk is talentless from then on... what's the harm? delete him and start again.
i for one would do the quests as they don't require that much time and you get that nifty starting blue gear which can last you to level 70 if you don't try real hard to replace it (i wouldn't try ....).