Whenever Penguin 4.0 hits, its impact would be visible. Websites went into Google Penalty would possibly get their repo back and those still spamming could be hit out. We may see changes rapidly over the next month or so and then once it is good enough.

1. GOOGLE PENGUIN 4.0 WILL BE THE
NEXT AND LAST PENGUIN UPDATE

2. For the geeks who have been waiting for the latest Penguin update since
ages, this news could be a breather. Googler Gary Illyes has confirmed that
the the next update will be here soon with the name Penguin 4.0 and will be
the last one. That means, we won't see new version of the update after this
one.
Now, Google has probably decided to clean the air. Gary's latest tweet on
Twitter could be taken as major headway. He said that the upcoming update
could be be the last Penguin update. Google made it clear on occasions that
the next Penguin algorithm should be the real time version and with real
time algorithms.

3. This paves the way for new Penguin penalties and recoveries to happen all of
the time. The latest version appeared from the Google is similar to what they
said when Google Panda was being rolled out. The company embedded
Panda algorithm into its core algorithm and stopped rolling it every six or
twelve month. This time probably the Penguin should be very quick, based on
how quickly Google indexes new and old links.
Whenever Penguin 4.0 hits, its impact would be visible. Websites went into
Google Penalty would possibly get their repo back and those still
spamming could be hit out. We may see changes rapidly over the next
month or so and then once it is good enough. Until it happens, let's wait and
watch for the next official statement.
Read More: http://www.brainpulse.com/articles/seo-sem/google-penguin-4-0-
last-penguin-update.php

4. www.brainpulse.com