1) Officially, we have always insisted that Rawhide packages are not recommended for stable releases users and not a means to Get New Stuff. Nevertheless users tend to do that now and then and we have even taken steps to correct it including not shipping a rawhide repo file by default. It is part a social problem and not new at all.
2) Preupgrade - Yes, this is a potential problem and needs a fix. I would note that Richard Hughes is replacing Preupgrade with a distribution neutral tool built on top of PackageKit and would appreciate more help in getting it up and running.
3) Yes, thanks for bringing this up. We definitely need to fix this problem from the new update policy
4) Not "security tools". Just one tool that Fedora is concerned about, for the legal implications and I have been recommending a revaluation as well
Overall, I still think we are doing a better job than many other distributions (c.f. SELinux, compiler flags etc)