Google Penguin Update September 2012:
- Random Generator Introduced – all of the sites in our database will now be given a number. Our random generator™ will draw a few “lucky” winners each day and get them slapped (loss of rank) and we will throw in random penalties as well.
This quote looks like taken out of the context, so it does sound threatening but I doubt this was his point. I don’t anticipate anything to happen, unless you or your competition are low quality spam websites.
Major keywords don’t have those so doubt anything will change for those on the top or those lurking around the top waiting for their moment 
.