Ha that is amazing! If dogs can feel contempt, Aspen in that first photo is what it looks like. This new puppy is supposed to be "Mike's dog," so we're getting one of these sweet little mongrels from Moro Shepherds, not a 2nd V. However, considering the breeder's description of our puppy at 6 weeks old, "not a V" is debatable... "Your girl is such a sassy pants. Often she just goes off and does her own thing while the other pups mostly stay in a group. She also is very comfy with vocalizing things that displease her. She will be a breeze to train as she is so communicative with people."
Everyone's advice so far is pretty much in line with all my research---do the intro on neutral ground, don't create opportunities for possessiveness or jealousy to cause problems, maintain the existing dog's routine and lifestyle as much as possible, supervise them closely for a few weeks, and wait while everyone acclimates, eventually.
If anyone has more advice, keep it coming! Otherwise, I'll report back after the little one's arrival.