Last night I received a message from Facebook regarding our Fan Page. The stats were rather vague but still helpful. Here are the stats that were reported:

+xxx Fans this week (xxx total Fans) x Wall Posts, Comments, and Likes this week (x last week) xxxx Visits to your page this week (xxx Visits last week)
The message looked a bit spammy at first until I checked out the headers. Plus the email address that it was sent to is only used for Facebook so that helped with the legitimacy in my mind.
According to an article from Mashable the feature has not been officially announced yet but jives with January’s rollout of Post Insights which tells you the reach and feedback level of each item you post to a Fan Page.