On Sunday, I was alerted by Fredrik of something Vito De Palma (ESPN journalist) wrote on Twitter.
Vito De Palma
Temas cabezas de serie: FIFA hara una tabla promediando los ultimos 3 Mundiales y 3 años de ranking. Colombia con suerte estara en 3ra urna
Seeding: FIFA will use the average of the last 3 World Cups and the last 3 years of ranking. With luck, Colombia will be in the 3rd pot.
This means FIFA would revert to the seeding formula used for the 2002 World Cup and they will seed the whole field (something they have never done before).
When asked for the source of his claims, Mr. De Palma provided this official PDF document (Brazil 2014 regulations in Spanish, see the document in English), pointing to article 18 on page 24. Those are the regulations regarding seeding for the preliminary draw (based on the FIFA ranking). The final draw is covered in article 31, page 40 - the usual text about the FIFA Organising Committee forming groups by seeding and drawing lots whilst taking sports and geographic factors into consideration, as far as possible. Nothing about the seeding system.
I can't quite understand how Mr. De Palma can tweet unverified facts to more than 80000 followers.
Looking to double-check, I've search on the internet more about seeding in the Spanish-language press and I've found another gem on at least 5 websites. According the articles on RCNRadio, Depor.pe, ViveDeporte, StudioFutbol and Comutricolor, the top 5 teams in the September 2013 FIFA ranking will be seeded for the final draw. These articles were publish a day or two after FIFA announced the seeding system for the African play-offs (the top 5 African teams involved in the play-offs will be seeded according the to September 2013 FIFA ranking). Sport journalism at its best!
As CNN's Tancredi Palmeri said, FIFA will make a decision regarding the seeding in the following months.