Good question. I have Premiere Elements 11 Windows 8 64 bit but no touchscreen.
I went searching online to see just what those touch gestures were for Windows 8 and came across the following which may be of interest to anyone following your thread and wanting to know just what the touchscreen gestures are.
I have not come across anything online about this but I will keep looking unless someone who has Premiere Elements and Windows 8 with touchscreen posts the answer.
I did find this one online review of Photoshop Elements and Premiere Elements where the reviewer talks to the matter of Adobe and tweeking the programs for touchscreen.