What would it be? What in your mind can a search engine announce to the public and have such a drastic impact on the SEO community? I asked this question in a thread over at Search Engine Watch.
So what did people say? (1) The announcement by Google of a pay for inclusion service. (2) Google Desktop now utilizes the contents of your computer to give you customized search results. (3) Microsoft buys both Yahoo and Google (MicroYahoogle). (4) Google releases a 64-bit operating system that is backwards compatible with all Windows software. (5) Google announces new open source algo.
My personal favorite would be number five, "Google announces new open source algo."