Andem - 4:17 am on Mar 9, 2012 (gmt 0)
I'm seeing some very odd results, it appears at least right now (04:00 GMT), something has changed. I'm seeing a dance from both my mobile phone (Dolphin browser both with Android user-agent and "Desktop" agent tested). Desktop results don't mirror the results from my phone, but still different from a few hours ago.
(google.com EN) Certain on-topic keywords (one a trademark) which had Wikipedia mostly in position 1 are completely gone from the first 5 pages; other keywords see a lot of low quality results demoted; seeing improvement in results and an increase in traffic for these hours;
A lot of keywords I'm monitoring have slightly improved in rankings overall but it seems to be dancing.
edit to add: Extremely bizarre! A wikipedia page which used to rank first doesn't even rank for the url though it is still in the cache.