I would not bet on Eb2 filing dates movement. 90% of the EB2 downgrades will be after the date of May 15, 2011. Not a lot of folks who can file AOS directly will be willing to downgrade or have the support of their company. If my date was before May 15th, I would not have downgraded and put additional scrutiny on my application (with the current admin and constant rule changes).