Today (one hour ago) I noticed that the four remaining mercs (out of 2600 lights that have been HPS since 2007) in my municipality have been relamped, after being very dim for years.
EDIT: They have now been replaced by HPS!
Another surprise, but not a good one, is that they have installed LED streetlights on a newly built road and maybe replaced some HPS with them on another road. I have been busy today and have been away for a couple of weeks, so I haven't had time to check them out yet.