The multitasking improvements and ability to use keyboard shortcuts to control it will be welcome.
Maybe it was mentioned in the Keynote but Universal Control is a major improvement to Sidecar:
Quote:
Use your keyboard, mouse, and trackpad across Mac and iPad
Use a single keyboard, mouse, or trackpad to work between your devices. When you move from your Mac to your iPad, the cursor for your mouse or trackpad transforms from an arrow to a round dot, automatically changing shape to the one that is best suited for the device.
Drag and drop content between devices
Use your mouse or trackpad to drag and drop content between your devices, perfect for when you’re sketching a drawing with Apple Pencil on your iPad and want to drop it into Keynote on your Mac.
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And UC works with ‘up to 3 devices’ (3 macs? 3 iPads? Any combo? It’s not clear)