My guesses - productivity as #1. Put apps "anywhere" on your desk/workspace, pick them up and move them around like physical objects, resize them freely. Entertainment will be another big push, especially with the display quality advantage they have. Fitness will be a third pillar with Fitness+ workouts "in the studio" and some fitness games. Communication/collaboration will also be a focus, though this one I'm less clear on since having a headset on prevents you from sitting in front of a camera for a zoom call. But SharePlay will definitely play a role. Then finally, gaming.