According to Darrin Ward, (former owner of SEO Chat), he has an inside source at Google who is feeding him some information. He has chosen to make some of that information public at his SEO Town forum. According to the source, we should be watching several datacenters over the next two weeks, which I assume means that we will be seeing some significant changes coming. This may correlate with rumors that Google will be making changes and then leaving things alone for a while. In any case, here is a partial list of datacenters that he mentions. Feel free to check out Darrin's post for the complete details.