Last week an SEO bloke from the UK, Patrick Altoft, stumbled across a Google test/update.
Google Instant was tested then released. It would seem this change also is not far off given that it is in testing phase. This change, unlike Google Instant, will have implications on ranking and also clickthrough rates from the SERPS. It will allow users to preview the target page before they click.
Jim’s been here for a while, you know who he is.