Yeah... I can't easily see how a hovering cursor could be done with optical, unless they were exceptionally clever with those lenses. Though... I have to say, I'm finding myself encouraged by people reporting that the iPad Pro doesn't seem to suffer from the lack of a floating cursor. Maybe, with super accurate nibs, the cursor is something which can be retired..? Hmm. I'd have to see it to believe it. I wonder if the two technologies could be combined..? A dot-film with camera plus EMR? It would seem like overkill, but then again.., no single solution has managed to squash every bug yet.