In the latest webmaster hangout video Mueller reiterated we can soon see a penguin update / refresh. He was joking when he said it is not today but will be in 2014. We all know from years of experience when Google does an update. It is mostly before the holiday season when the Business spikes. So as I guessed before it should mostly be in the 1st week of October.
Skip to about 53 minutes before you see the golden words from his month. We are waiting fingers crossed.
There are other places which discusses this.
Check it out here. http://searchengineland.com/nearly-year-later-finally-going-get-penguin-update-refresh-203210