HTC has just confirmed that the next U handset will be squeezable, so its owner will be able to make gestures by squeezing the sides or swiping on them. This way, HTC plans to take smartphone controls beyond the limits of the display.
http://www.notebookcheck.net/HTC-s-squeezable-handset-coming-in-less-than-a-month.213516.0.html