Following the Release Notes, the upgrade went rather smoothly. A couple of things got “tweaked,” however. The first, most obvious is the behavior of vi:
The default settings for vi have been changed. Display looks weird in terms of colors, etc. Can’t figure what vi/vim file needs changing. I have backups of course of all pre-upgrade config files. I’ve tried using the “old” /etc/vim/vimrc, but no change.