Matt Cutts announced today on twitter Penguin 2.0 is rolling out.

2.3% of English-US queries are affected to the degree that a regular user might notice.

This is the fourth Penguin-related launch Google has done, but because this is an updated algorithm (not just a data refresh), we’ve been referring to this change as Penguin 2.0 internally.
What should we expect in the next few months in terms of SEO for Google?