Size and Weight
The new iPad Pro is basically identical in size and weight to the 2018 version. The dimensions and case design are completely identical, meaning many cases and keyboard accessories designed for the 2018 iPad Pro will still fit the 2020 models; while they won’t accommodate the new camera bump, of course, an older case could still do in a pinch until new versions become available, especially if you don’t plan to use the camera often.
In fact, the only physical change other than the larger camera bump is a very slight difference in weight that is only going to be noticeable on the spec sheets; the 11-inch iPad Pro models gain about 3-5 grams, while both 12.9-inch iPad Pros increase in weight by about 10 grams.