I emailed the PDGA yesterday, I'm at work so can't access my personal email, but what I understand is that points acquired in calendar year 2012 is what is counted for the 2013 tournament. Points from any amateur division count. While the cutoff may change for 2013, for 2012 (points from 2011) was 500 for Advanced, 200 for Advanced Masters, don't recall other Advanced divisions. Search PDGA's website for the others.
Yeah, for the rest of 2012, I'm only playing PDGA sanctioned tournaments. I want an invite. I may place bottom 5% once I get there, but my intention is getting an invite so I don't have to wait to see if I can apply after the cutoff date.