1. I don't see Cijsters coming back to her position before the injury. her physical problem seems crucial. after she came back in hasslet and got this injury again, it will take a very long time until she will be 100 % ready.
2. the russian will stay at the top this year. they never had success in the AO, especially because the heat. the season is long- who thougt in this time last year, that by the end of the year Davenport will be no. 1, sharapova will be top 3 (after the AO this year), and that the belgian will be irrelevant (remember that last year the final was Kim vs. Justine). therefore, the AO is no indication for nothing in the future.
3. neverthelss, it will be very suprising if S. Williams would be at the top of the ranking this year. but, who knows?