The overall 2012 Boston Marathon field is approximately 2 and 1/2 minutes faster than in any previous year. Therefore, all wave breaks have been adjusted for this year. We cannot change anyone's seed or wave assignment.
Here are the comparisons from last year to this year:
2011 Break between Wave 1 and 2 – 3:22:41
2011 Break between Wave 2 and 3 – 3:45:57
2012 Break between Wave 1 and 2 – 3:19:10
2012 Break between Wave 2 and 3 – 3:43:48