ColourOfSpring - 8:40 am on May 12, 2013 (gmt 0)
The theories put around are that Google has been bringing it's tolerance thresholds down for "good" versus "bad" links and that the next update will lower those significantly. I guess it's a no brainer. Things are pretty transparent about what Google is intent on targeting even if the technicalities are somewhat obscure.
Just to be clear - does this theory mean that Google would have a lower tolerance to exact match anchors? Wouldn't this make negative SEO even easier? If Google have an even lower tolerance for exact match anchors, just throw some exact match anchors at the competition. If ranking your own site is now a riddle wrapped up in an enigma (which it seems to be becoming more and more), then you can at least just take out a few of the weaker (non-big-brand) ranking sites by trashing their link profile.