I have noticed that a couple of my online competitors who lost their positions (I'm assuming because of some Google update and most probably the manual spam) have changed their pages' url and is ranking again.
They have change nothing on the page, except the URL, and probably they have dropped some bad links.
I have also noticed that Google is giving preferences to new pages & domains over older domains especially those who lost their previous position in SERPS.
Is it possible that the upcoming Penguin update would reset this trend?