I can confirm that on a ThinkPad X60s and would like do add two things:
1.) This is actually a regression from 2.6.25 (tested with package
version 2.6.25-7), which had channels 12 and 13 available. This can be
quite confusing in case you are used to associate to an AP on one of
these channels -- and suddenly, this connection seems to be broken with
the new kernel. That could usually lead to the assumption that something
seriously is broken within the wireless setup.