See the updated seeding list.
Update: 30 January 2012
On the morning of 27 January, the release date for the March 2012 ranking was 14 March. Later that day, FIFA brought the date forward by one week, thus the ranking will be published on 7 March, two days before the draw and what is written below is no longer true (i.e. the games on 29 February will now affect the seeding).
I did write on Friday to FIFA, AFC and all the involved FAs, but I can't claim the change of release date is because of me.
Original article follows:
The AFC have announced yesterday the draw for the fourth round will take place on March 9.
Last August, AFC's Competition Committee decided to use the latest FIFA rankings to seed the teams for the fourth round draw.
Looking at the FIFA ranking schedule, this means the February ranking will be used, thus the 29 February games (last match day of the third round will not affect the seeding).
It would be better (in my very humble opinion) to postpone the draw for March 16 (two days after the released of the March ranking).
Already qualified: Jordan, Iraq, Uzbekistan, Japan, Australia and Iran.
Only one match left before the February ranking is released: a friendly involving the United Arab Emirates and Uzbekistan, on January 29th. However, Uzbekistan are safe between Iran and Iraq (that's a difficult place to be in, isn't it?).
Here's the table, with Uzbekistan's friendly counted as a defeat. With a win, Uzbekistan would have 469 points, not enough to overtake Iran.
4 years ago, the 4 lowest seeded teams of the 10 qualified for the 4th round were placed in a single pot.
Pot 1: Australia, Japan
Pot 2: Korea Republic, Iran
Pot 3: Uzbekistan, Iraq
Pot 4: Jordan, Saudi Arabia, Kuwait, Qatar.
If Korea Republic don't qualify, Uzbekistan will climb to Pot 2, while Jordan will climb to Pot 3.