Luckily I came home for lunch to check the progress. The manager accidentally gave the installer a XL803 (8000 series) and they started to install it. I wasn't happy, but a quick hpone call and after lunch the installer returned with the IAQ. It's the first IAQ they've installed, so I think it will help having all the correct settings ready for him.
I'm starting to think I have one of the most advanced residential HVAC set-ups in my area other than possibly a few Infinity installations... whcih the Trane guys said the HO's aren't happy with. I feel special!
The installer confirmed the that HP does cycle on the furnace during defrost, but he wasn't sure there was a time delay to initiate defrost for a seamless transition.