What will Apple do if Microsoft succeeds in this Desktop + Tablet mesh?

As a Microsoft user I would like to get your opinion on how Apple will counter this. Will they just go on with their lives and keep doing their stuff or will they make significant changes? I for one think that they will make a change and implement Launchpad rather than making it an app. For iOS I think that when you get a notification your Notification center will do a little jump like the camera app does on the lock screen. I would like to know your thoughts on what they would change on their Mac OS X or iOS