On December 18, the Boston Globe published an article discussing possible changes to Boston Marathon qualifying times and the registration process. Another article the next day addressed the issues from an historic and contextual perspective.
According to the first article, is likely that the BAA will make an announcement in January for changes that would take effect for the 2012 Boston Marathon. It is expected that some or all of the qualifying times will be adjusted to slightly faster times. However, the BAA has indicated that they "will honor qualifying times run in what has been the traditional window, which opens in mid-September." I assume this means that people who ran what they thought were qualifying times this fall will be able to use those times, even as the new times come into effect for those racing after the announcement is made.
Of course there will be some disappointed people, including those training now for winter or early spring races with target times based on old qualifying times. But there will also be disappointed people if they do not change the times, just as there were on October 18 this year. Personally I know that I have likely lost my chance to qualify with a 4:00 time for the F45-49 age group, but that is OK. It mike take me a bit longer to get there, but I still will.