Some users have reported that they're now seeing results streaming as they type from the Google homepage, before they ever click "Search". That might explain today's doodle and will likely be a major part of Google's event later today.
The video above was posted in the forums at Websonic.nl and clearly shows results popping up before the query has even been completed. In this case the search comes from Google UK; it's unclear if the function has hit the US yet (none of us has seen it). But clearly it's on Google CEO Eric Schmidt's mind:
I predict big things happening today at Google. We're already fast.. fast is about to get faster.