For now, we only have 1 naturalized athlete qualifiyed to Rio, long distance runner Trihas Gebre, born etiophian but in a relationship with a spanish guy for more than four years.
But a lot more are going to be added to the list. Spain has a lot of cuban/moroccoan immigration and lot of our athletic team are actually foreign borns. But I'm not against them in our team, we don't pay them to stay with us, and usually our moroccoan athletes just started their carreers as athletes once living in Spain.
I think the federation has learned for they mistakes. Back in the day they pretty much give citizenship to the first athlete they could find, and the doping bans from Josephine Onyia and Bezabeh had turned a lot of people against the naturalized athletes of these days. Orlando Ortega received a lot of negative vibe from public and athletes when he obtained spanish nacionality, for example. And fans still attack people like Adel Mechaal who has been living in Spain since he has 3 years old.
Spain as a country is an advanced society for a lot of things but we still has problems with racisim in sport.