Ummm, gee, I'm bumping this up 'cause on some of G's servers I'm seeing the largest changes to some categories that I've seen in a very looooooong while. About ten of the 20 or so that I watch regularly are *very* different. Curious if others are seeing same... Don't know if it'll propagate to all the servers, or what. Interesting.
Since I noticed this almost one week ago, I have seen these SERPs twice on Google UK (for sustained periods).
I'm unsure what's going to happen now. A real update would be nice :-)