I'm not sure if this is related to the panda update in the UK, seems to have happened around the same time, but a lot of my key search terms now seem to show the singular when you start typing in the google search box, wheras before they were showing the plural.
Just wondered if anyone else had noticed this or whether it was just google suggest having a 'dance' of some sort and re-aligning what it suggest to what people have actually been searching ?