There hasn't been one for four months or so and now its currently happening. DigitalPoint's forum is discussing this now in a thread titled Google toolbar Update. Proof, see the SEO Chat PR tool for a new page at DigitalPoint that just received PageRank.
I had to get this one in before I split for the remainder of the week. Good luck all, oh and I am sure there will be some deeper thoughts into this update over the weekend.