I'm seeing a mixed bunch of results in from google.co.uk. Sites which have been in the 1st position for years, extensive backlink profile and EMD domains too for some pretty big words have dropped several positions, and on some keywords, wikipedia pages are ranking 1st, compared to ecommerce sites which optimise for the keywords.
One of my sites has taken a bit of a drop all of a sudden at the same time the results changed, like always though, I anticipate a review of the results and things to return back to normal-ish soon.