aristotle - 1:49 pm on Jul 31, 2012 (gmt 0)

It will be interesting to see the effects of the next update. Some people have apparently made a lot of changes, such as revising pages and/or getting backlinks deleted. Others, like myself, have made no changes at all.

So it depends on what the next Penguin update includes. If it is only a "data refresh", then presumably only the site owners who made changes will see any effects. But if Google tweaks the Penguin part of the algorithm, then everyone should see some effects.

Also, I'm still wondering if the delay might be caused by work to develop a system that lets site owners disavow backlinks.