I don't wish to see any capacitive button because they're probe to accidental activation. As for gesture, they should do it the jailbreak way on existing hardware. There is no need for capacitive button to do things like brining up the multitasking dock, switch to next or previous applications. They can also swipe on the task bar left and right to switch application if necessary. Alternatively, swipe up from the home button to activate the multitasking dock, swipe up from bottom left of screen to go to previous app, swipe up from bottom right to go to next app. These are some of the gestures some of us have been using on JB phones. There are other ways too, such as long pressing the volume buttons to go to previous and next application. Activator is a wonderful tool to incorporate into the stock firmware. With so many JB gurus hired by Apple, I hope Apple listen to these guys' ideas.