AFC have announced the draw for the 4th round will also be based on the FIFA rankings.
2014 F1FA World Cup Brazil™ - Asian Qualifiers Round 4 - Draw
The Committee decided to take the latest FIFA/Coca Cola rankings at the time of the Draw for Round 4 as F1FA Ranking has already been implemented for Round 3.
Yes, it's F1FA, not FIFA :)
The last match day of round 3 takes place on February 29, while the first match day of round 4 is scheduled for June 3.
I think the draw will take place in March, using the March FIFA ranking that will be released based on my calculations on March 15.
4 years ago, the 4 lowest seeded teams of the 10 qualified for the 4th round were placed in a single pot.
Here's the March 2012 FIFA ranking, counting scheduled games as defeats:
|15||United Arab Emirates||208|
Pot 1: Australia, Japan
Pot 2: Korea Republic, Iran
Pot 3: China PR, Jordan
Pot 4: Uzbekistan, Kuwait, Qatar, Saudi Arabia