The following was released by Google:

"New 'parked domain' classifier: This is a new algorithm for automatically detecting parked domains. Parked domains are placeholder sites that are seldom useful and often filled with ads. They typically don't have valuable content for our users, so in most cases we prefer not to show them."

Duplicate Content down, Original Up

"Original content: We added new signals to help us make better predictions about which of two similar web pages is the original one" when dealing with two competing sites for search engine rank. This of course has been put in place to detect websites with content taken(stolen) from another site. In college they call that plagiarism. In Search Engine Land, they call it scraping. Either way, it's not original and what Google started earlier this year with the PANDA updates, they are still attempting to make more accurate. We of course don't know how long this will take, but Google said it was going after sites that had low-levels of original content in January and delivered a week later.