not much just nightwing and wonder woman are my favorite male and female characters plus I think they could carry dc's spy corner though a.r.g.u.s like cap/widow did in the movies. also it would be just fun to see dick bringing alot young fun and energy into diana's life and diana bringing maturity and status into dick's life.
It would also be a cross generational relationship, so it would have more impact on the wider dcu. like how would it affect batman, superman, donna troy, steve trevor, babs and starfire even tim and cassie's relationship a little. on top of that dick finally gets a mature and stable relationship and diana finally gets a partner who is big enough hang with her but not overshadow her.
Plus the slightly older more powerful woman with the younger hot male model/eye Candy is a great power dynamic for DC and diana/dick. If you want an idea of how there personality's would look together just go watch Aladdin, dick/aladdin and diana/jasmine.
but I know dc wont let diana/dick even be in the room. So
.