I'm not sure if this is right
We got the "card production ordered" notice but our child got the welcome notice. It seems to me that for those who got the welcome notice might need to do ADIT processing (cf.link below).
http://immigrationvoice.org/forum/forum5-all-other-green-card-issues/21012-what-is-adit-processing-in-gc-process.html
BTW, nice to see you again!