Before we left Google had an update - on one of the forums we frequent "Google Guy" gives some hints about the changes -

http://www.webmasterworld.com/forum30/29727-2-10.htm

You can click on his user profile and gain some useful information. The main thing is that as with algo changes most of them aren't done all at once - so wait for a bit before making any drastic changes.

Have a good one.