For those who didn't see on Facebook, on Christmas Eve, I went to the mailbox to find this:
This is the paperwork we've been looking for! It's our appointments for the USCIS fingerprinting! We got on January 18. After that, it might take a couple weeks to get the results. After that point, it's just a matter of wrapping up the paperwork before our dossier goes to China! Of course, by my very rough calculations, it's probably going to be end of February before we get to that point.