OK, the DIL has told her family, so now I can tell you.
My wife's youngest son and his lovely wife are expecting. ETA is May 2017.
Any doubts, reservations and/or fears my wife has harbored about pulling up stakes here and moving to Colorado have just gone POOF!
I'm just praying that things hold together long enough that we can make a graceful, stress free exit from The People's Demokratik Republik of Kalifoniastan....