The following video is from Microsoft Office Vision 2019. If you visit the YouTube source, you'll find an interesting discussion about this five-minute+ clip.
Video Presentation from MIX09: Untold Stories of Touch, Gesture, & NUI
Joseph Fletcher, Design Manager, Microsoft Surface
"Learn about new patterns, behaviors, and design approaches for touch and gesture interfaces from a practitioners point of view. Learn early lessons from applied knowledge of touch applications, devices, and design methods."
LukeW's notes from Joseph Fletcher's presentation
LukeW's post: Design Principles at Microsoft
LukeW is the Senior Director of Product Ideation & Design at Yahoo! Inc.