The reason I don't bother writing a separate change log is that I'd end up duplicating what the 5 changes on that page (above 1.2, the previous release) already say. All are subtle things that are of little meaning to most people, so I figure those that really care are going to read the changes anyway. Maybe I should revisit this next minor release.
I should note that there is WAY more in that Firefox point release than in any Go point release. We strictly include only critical fixes for issues for which there is no workaround. For Go point releases, most people should just install them and move on. For 99.9% of Go programmers there is "nothing to see here".
As has been already mentioned, we do provide a detailed change log for major releases: http://golang.org/doc/go1.2 http://golang.org/doc/go1.1