Somewhat of a continuation of this thread but deserves its own topic:
Basically as most of you know, you can monitor how many pages are non-indexed from WMT.
Have any of you experienced any suspicious drop-offs in these numbers the past month? One of the sites I monitor when from 5k to 4k on 1/9/2013...which is really odd. In the above mentioned thread, some are seeing even bigger spikes in their "non-indexed" numbers.
Anybody notice a common theme with the pages not indexed?
Could this be a sign of a big change or update to come?