I am an American male who just married a Brazilian woman. I'm retiring in 2015 and then moving to Brazil. What will I need to do to get dual citizenship? My second question is what will my wife need to come to America?

How does she want to come to America and for how long ?

For a few months to visit ? Or to live here for a few years.

If you two live in Brazil, she would need B2 visa to enter US for a temporary visit.

You can obtain Brazilian citizenship in a year if your spouse is a Brazilian..
Brazilian nationality law - Wikipedia, the free encyclopedia

Just for visits to my family. No more then a few weeks at a time. She'll come here as my wife, if that's what you mean. Thanks for any assistance you can give us in this dilemma.