In Oceania, the four lowest-ranked Member Associations (based on the FIFA/Coca-Cola Ranking of July 2011, and for sporting reasons) will contest Round One.
The four lowest-ranked teams in OFC are: Tonga (192), Cook Islands (195), American Samoa (203) and Papua New Guinea (unranked). However, Papua New Guinea were given a bye to Round Two - being placed in second pot, at the expense at Samoa (7th in OFC).
Wikipedia says Round One will probably be staged by Samoa (no reference though) and probably that's what "sporting reasons" means.
Thanks Andrew Culshaw for pointing this out.