All packages can be used by end users.
The only thing that should be kept away from distribution is the "mantissa" directory in the subversion repository which is only used as a code base for [math] developers. Some packages have already been transfered for 1.2 release, other packages will follow later, and still others will probably be dropped sometimes. This directory will therefore reduce as code is transfered to o.a.c.math and finally disappear. However I think this directory will be manually discarded when the release will be cut out and that the OSGi configuration in pom will never see it.