I had the 10.5" and once Apple started doing in-store trade ins again I took it to get the gift card with the idea of the keynote coming in March. After calculating eBay fees and shipping, I think I would have made $10 more going that route over trading in. I probably could have gotten more going with Swappa, but I was also having the white spot issue and would've had to disclose that bringing down the value. Since then I've fallen back to my old iPad Air 2 which still works surprisingly well on iPadOS 14, which is shocking. It's been a month with it, and I'm looking at another month with it until the new iPad arrives.
But yes, I am ordering the iPad Pro 12.9 Wi-Fi this time around, specifically 256GB Silver. Mostly it's for the display. I still think the 9.7-11" form factor is the sweet spot, but I've never really tried the 12.9". I think my thoughts on it were skewed when I saw the original model in person with that bezel-licious design, but it seems more manageable in the newer 2018+ design. To get an idea of the weight and size, I stuck a standard 8.5x11 sheet of paper on top of my original iPad (which weighed 1.5lbs) and toted it around the house. I think it might be a bit harder to type on when walking, but I don't think that will be a big deal for me. The iPad rarely leaves the house.