You probably do not have to be concerned unless you have a spammy site or bought one of those packages with 5,000 links from crappy directories.
I don't think that Google actually knows what a level playing field is. They are the search engine that threw that concept out the door many years ago.
It will be interesting to see how much this scrambles the search results.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin