Google SERPs: Can you dig it?

Just a few hours ago TechCrunch reported that one of their readers was seeing a new interface on the Google SERP. The interface is a Digg style interface allowing users to vote for/against the search results. Can you really see Google doing something like this long term? Whilst this was the first I'd heard of it, it isn't anything completely new. Google have been testing something similar since late 2007. This feature hasn't ever been available in the experimental area on Google but it seems like it has been available to a small percentage of users. This latest test features differences to what has been seen previously, namely that users can change their vote.