Actually Jack, the PDF invasions for test were announced on Dec. 18th, 2009 and the first one I know of happened on the 19th the next day. This hasn't just been released there, it's been on test for awhile now although not seen very often. But I only go on test once a week.
Here's the link to the original announcement.
http://piratesonline.go.com/v3/#/new...ters3#comments