Google released a video of a "look under the hood of search" and an explanation of "How Google makes improvements to its search algorithm."
Truth is, although the video is very sharing and really fun to watch, it does not give us any additional insights into what we already know. Here is the video:
The good thing is that, we already know a lot. The bad thing is, the only thing I learned from this, was as Matt Cutts said, "at 52 seconds in, you can see Matt's wrestler mask (long story), a waving cat from Japan, and an Eika Kerzen candle (also a long story)."
Anyway, watch the video. If you have any thing to share, do so.