Literally just a few minutes ago, I received a text message and email that my case status had been updated.
"On September 11, 2013, we ordered production of your new card. Please allow 30 days for your card to be mailed to you. If we need something from you we will contact you. If you move before you receive the card, call customer service at 1-800-375-5283."
I'm thinking that I can receive the new green card either by the end of this week or early next week. I'm keeping my fingers crossed that the case updates again with the tracking number (as it has with some folks). But, as always with USCIS, nothing is guaranteed, lol.