Penguin 2.1 has officially been released today.
Matt Cutts, Google's head of search spam announced it on Twitter:
Penguin 2.1 launching today. Affects ~1% of searches to a noticeable degree. More info on Penguin: http://t.co/4YSh4sfZQj— Matt Cutts (@mattcutts) October 4, 2013
I saw signs of this around 9am EDT this morning but didn't see enough chatter to cover it yet. I suspect over the weekend the forums will light up. Some of the early stats I saw on sites that got hit were huge.
Of course it was a late Friday release:
I'll have more details on this on Monday, with the impact on real webmasters.
For more details on Penguin click here.